Rewrite paths to be internal to repo

As-per [this
ticket](https://app.asana.com/0/1207142155269470/1207142155269473/f). The
current content of these files are (were?) served up by the ruby application in
`/website` and could be accessed using `/docs/filename.html`. Since this is
being retired, this content now needs to be accessible (and navigable) from the
GitHub repository alone.

In order to accomplish this, links to `file.html` need to be rewritten
to `file.html.markdown`. The suggestion in the ticket was to use a
codemod to do this - however this could instead be accomplished using
the following `sed` expression:

```bash
find . -type f -name '*.*' -exec sed -i -E '
  s|\/intro\/(.*)\.html\)|\/docs\/intro\/\1.html.markdown\)|g;
  s|\/docs\/(.*)\.html\)|\/docs\/\1.html.markdown\)|g' {} +; git status
```

docs/agent/basics.html.markdown

@@ -57,17 +57,17 @@ There are six important components that `serf agent` outputs:
   By default, this binds only to localhost on the default port. If you
   change this address, you'll have to specify an `-rpc-addr` to commands
   such as `serf members` so they know how to talk to the agent. This is also
-  the address other applications can use over [RPC to control Serf](/docs/agent/rpc.html).
+  the address other applications can use over [RPC to control Serf](/docs/agent/rpc.html.markdown).
 
 * **Encrypted**: This shows if Serf is encrypting all traffic that it
   sends and expects to receive. It is a good sanity check to avoid sending
   non-encrypted traffic over any public networks. You can read more about
-  [encryption here](/docs/agent/encryption.html).
+  [encryption here](/docs/agent/encryption.html.markdown).
 
 * **Snapshot**: This shows if Serf snapshotting is enabled. The snapshot
   file enables Serf to automatically re-join a cluster after failure and
   prevents replay of events that have already been seen. It requires storing
-  state on disk, and [must be configured](/docs/agent/options.html)
+  state on disk, and [must be configured](/docs/agent/options.html.markdown)
   using a CLI flag or in the configuration directory. If it is not provided,
   other nodes will still attempt to reconnect on recovery, however the node
   will take longer to join the cluster and will replay old events.
@@ -76,7 +76,7 @@ There are six important components that `serf agent` outputs:
   be appropriate to the environment Serf is running in. It defaults to
   optimizing for a LAN environment, but can also be set for WAN or
   local-only communication. The profile can be set in
-  the [configuration](/docs/agent/options.html).
+  the [configuration](/docs/agent/options.html.markdown).
 
 ## Stopping an Agent
 

docs/agent/encryption.html.markdown

@@ -10,7 +10,7 @@ description: |-
 
 The Serf agent supports encrypting all of its network traffic. The exact
 method of this encryption is described on the
-[encryption internals page](/docs/internals/security.html).
+[encryption internals page](/docs/internals/security.html.markdown).
 
 ## Enabling Encryption
 

docs/agent/event-handlers.html.markdown

@@ -12,7 +12,7 @@ Serf's true power and flexibility comes in the form of event handlers:
 scripts that are executed in response to various events that can occur
 related to the Serf cluster. Serf invokes events related to membership
 changes (when a node comes online or goes offline) as well as
-[custom events](/docs/commands/event.html) or [queries](/docs/commands/query.html).
+[custom events](/docs/commands/event.html) or [queries](/docs/commands/query.html.markdown).
 
 Event handlers can be any executable, including piped executables (such
 as `awk '{print $2}' | grep foo`), since event handlers are invoked within
@@ -137,4 +137,4 @@ $stderr.reopen('/dev/null', 'w')
 ```
 
 **Note:** This method is really only useful for event handlers, and is mostly
-useless for [queries](/docs/commands/query.html).
+useless for [queries](/docs/commands/query.html.markdown).

docs/agent/options.html.markdown

@@ -36,7 +36,7 @@ The options below are all specified on the command-line.
   If this configuration value is changed and no port is specified, the default of
   "7946" will be used. An important compatibility note, protocol version 2
   introduces support for non-consistent ports across the cluster. For more information,
-  see the [compatibility page](/docs/compatibility.html).
+  see the [compatibility page](/docs/compatibility.html.markdown).
   Note: To use an IPv6 address, specify "[::1]" or "[::1]:7946".
 
 * `-iface` - This flag can be used to provide a binding interface. It can be
@@ -89,7 +89,7 @@ The options below are all specified on the command-line.
 * `-event-handler` - Adds an event handler that Serf will invoke for
   events. This flag can be specified multiple times to define multiple
   event handlers. By default no event handlers are registered. See the
-  [event handler page](/docs/agent/event-handlers.html) for more details on
+  [event handler page](/docs/agent/event-handlers.html.markdown) for more details on
   event handlers as well as a syntax for filtering event handlers by event.
   Event handlers can be changed by reloading the configuration.
 
@@ -124,7 +124,7 @@ The options below are all specified on the command-line.
   are too tight.
 
 * `-protocol` - The Serf protocol version to use. This defaults to the latest
-  version. This should be set only when [upgrading](/docs/upgrading.html).
+  version. This should be set only when [upgrading](/docs/upgrading.html.markdown).
   You can view the protocol versions supported by Serf by running `serf -v`.
 
 * `-retry-join` - Address of another agent to join after starting up. This can
@@ -157,7 +157,7 @@ The options below are all specified on the command-line.
   By default this is "127.0.0.1:7373", allowing only loopback connections.
   The RPC address is used by other Serf commands, such as  `serf members`,
   in order to query a running Serf agent. It is also used by other applications
-  to control Serf using it's [RPC protocol](/docs/agent/rpc.html).
+  to control Serf using it's [RPC protocol](/docs/agent/rpc.html.markdown).
 
 * `-snapshot` - The snapshot flag provides a file path that is used to store
   recovery information, so when Serf restarts it is able to automatically
@@ -223,7 +223,7 @@ at a single JSON object with configuration within it.
 
 * `role` - **Deprecated**. Equivalent to the `-role` command-line flag.
 
-* `disable_coordinates` - Disables features related to [network coordinates](/docs/internals/coordinates.html).
+* `disable_coordinates` - Disables features related to [network coordinates](/docs/internals/coordinates.html.markdown).
 
 * `tags` - This is a dictionary of tag values. It is the same as specifying
   the `tag` command-line flag once per tag.

docs/agent/rpc.html.markdown

@@ -115,7 +115,7 @@ following request body:
 ```
 
 The `Name` is a string, but `Payload` is just opaque bytes. Coalesce
-is used to control if Serf should enable [event coalescing](/docs/commands/event.html).
+is used to control if Serf should enable [event coalescing](/docs/commands/event.html.markdown).
 
 There is no special response body.
 
@@ -217,7 +217,7 @@ the stream is stopped. The request body looks like:
     {"Type": "member-join,user:deploy"}`
 ```
 
-The format of type is the same as the [event handler](/docs/agent/event-handlers.html),
+The format of type is the same as the [event handler](/docs/agent/event-handlers.html.markdown),
 except no script is specified. The one exception is that `"*"` can be specified to
 subscribe to all events.
 
@@ -415,7 +415,7 @@ The request looks like:
 ```
 
 The `Key` should be 32 bytes of base64-encoded data. `24` and `16` bytes are also accepted, but 32 bytes are recommended for improved security. This value can be generated
-using the [keygen command](/docs/commands/keygen.html).
+using the [keygen command](/docs/commands/keygen.html.markdown).
 
 Once invoked, this method will begin broadcasting the new key to all members in
 the cluster via the gossip protocol. Once the query has completed, a response
@@ -507,7 +507,7 @@ successful, this number should be equivalent to the `NumNodes` field. If not all
 members are aware of a key, you should either rebroadcast that key using the
 `install-key` RPC command, or remove it using the `remove-key` RPC command. More
 on encryption keys can be found on the
-[agent encryption](/docs/agent/encryption.html) page.
+[agent encryption](/docs/agent/encryption.html.markdown) page.
 
 ### stats
 
@@ -577,6 +577,6 @@ The returned coordinate is valid only if `Ok` is true. Otherwise, there wasn't
 a coordinate available for the given node. This might mean that coordinates
 are not enabled, or that the node has not yet contacted the agent.
 
-See the [Network Coordinates](/docs/internals/coordinates.html)
+See the [Network Coordinates](/docs/internals/coordinates.html.markdown)
 internals guide for more information on how these coordinates are computed, and
 for details on how to perform calculations with them.

docs/commands/agent.html.markdown

@@ -15,6 +15,6 @@ performs the important task of maintaining membership information,
 propagating events, detecting failures, etc.
 
 Due to the power and flexibility of this command, the Serf agent
-is documented in its own section. See the [Serf Agent](/docs/agent/basics.html)
+is documented in its own section. See the [Serf Agent](/docs/agent/basics.html.markdown)
 section for more information on how to use this command and the
-[options](/docs/agent/options.html) available.
+[options](/docs/agent/options.html.markdown) available.

docs/commands/event.html.markdown

@@ -71,7 +71,7 @@ send the "deploy" event with "1234567890" as the payload.
 ## Receiving an Event
 
 The events can be handled by registering an
-[event handler](/docs/agent/event-handlers.html) with the Serf agent. The
+[event handler](/docs/agent/event-handlers.html.markdown) with the Serf agent. The
 documentation for how the user event is dispatched is all contained within
 that linked page.
 

docs/commands/keygen.html.markdown

@@ -11,6 +11,6 @@ description: |-
 Command: `serf keygen`
 
 The `serf keygen` command generates an encryption key that can be used for
-[Serf agent traffic encryption](/docs/agent/encryption.html).
+[Serf agent traffic encryption](/docs/agent/encryption.html.markdown).
 The keygen command uses a cryptographically
 strong pseudo-random number generator to generate the key.

docs/commands/rtt.html.markdown

@@ -11,7 +11,7 @@ description: |-
 Command: `serf rtt`
 
 The `rtt` command estimates the network round trip time between two nodes using
-Serf's network coordinate model of the cluster. See the [Network Coordinates](/docs/internals/coordinates.html)
+Serf's network coordinate model of the cluster. See the [Network Coordinates](/docs/internals/coordinates.html.markdown)
 internals guide for more information on how these coordinates are computed.
 
 While contacting nodes as part of its normal gossip protocol, Serf builds up a

docs/compatibility.html.markdown

@@ -25,7 +25,7 @@ can be upgraded without cluster disruption.
 
 This compatibility guarantee makes it possible to upgrade Serf agents one
 at a time, one version at a time. For more details on the specifics of
-upgrading, see the [upgrading page](/docs/upgrading.html).
+upgrading, see the [upgrading page](/docs/upgrading.html.markdown).
 
 ## Protocol Compatibility Table
 

docs/index.html.markdown

@@ -11,4 +11,4 @@ description: |-
 Welcome to the Serf documentation! This documentation is more of a reference
 guide for all available features and options of Serf. If you're just getting
 started with Serf, please start with the
-[introduction and getting started guide](/intro/index.html) instead.
+[introduction and getting started guide](/docs/intro/index.html.markdown) instead.

docs/internals/coordinates.html.markdown

@@ -14,7 +14,7 @@ allow the network round trip time to be estimated between any two nodes using a
 very simple calculation.
 
 Coordinates are obtained by adding a very small amount of data to the probe
-messages that Serf already sends as part of its [gossip protocol](/docs/internals/gossip.html),
+messages that Serf already sends as part of its [gossip protocol](/docs/internals/gossip.html.markdown),
 so this system scales well and incurs very little overhead.
 
 Serf's network tomography is based on ["Vivaldi: A Decentralized Network Coordinate System"](https://www.cs.ucsb.edu/~ravenben/classes/276/papers/vivaldi-sigcomm04.pdf), with some additions from ["Network Coordinates in the Wild"](https://www.usenix.org/legacy/events/nsdi07/tech/full_papers/ledlie/ledlie_html/index_save.html) and ["On Suitability of Euclidean Embedding for Host-Based Network Coordinate Systems"](http://domino.research.ibm.com/library/cyberdig.nsf/papers/492D147FCCEA752C8525768F00535D8A).
@@ -110,7 +110,7 @@ The following section shows how to perform calculations with these coordinates.
 
 Computing the estimated network round trip time between any two nodes is simple
 once you have their coordinates. Here's a sample coordinate, as returned from the
-`get-coordinate` [RPC call](/docs/agent/rpc.html):
+`get-coordinate` [RPC call](/docs/agent/rpc.html.markdown):
 
 ```
     "Coord": {

docs/internals/index.html.markdown

@@ -10,7 +10,7 @@ description: |-
 
 This section goes over some of the internals of Serf, such as the gossip
 protocol, ordering of messages via Lamport clocks, etc. This section
-also contains a useful [convergence simulator](/docs/internals/simulator.html)
+also contains a useful [convergence simulator](/docs/internals/simulator.html.markdown)
 that can be used to see how fast a Serf cluster will converge under
 various conditions with specific configurations.
 

docs/intro/getting-started/event-handlers.html.markdown

@@ -99,5 +99,5 @@ to invoke multiple event handlers as well as invoke certain event handlers
 for only certain Serf events.
 
 To learn more about these features, see the full documentation section
-of [event handlers](/docs/agent/event-handlers.html).
+of [event handlers](/docs/agent/event-handlers.html.markdown).
 

docs/intro/getting-started/next-steps.html.markdown

@@ -11,15 +11,15 @@ description: |-
 That concludes the getting started guide for Serf. Hopefully you're able to
 see that while Serf is an incredibly simple tool, it is also extremely
 powerful. The dead simple membership information and events system that
-Serf provides make up the building blocks of [incredible use cases](/intro/use-cases.html).
+Serf provides make up the building blocks of [incredible use cases](/docs/intro/use-cases.html.markdown).
 
 And because Serf is completely decentralized, fault tolerant, self-healing,
 etc. it is a dream tool for system administrators and built specifically
 for modern, elastic infrastructures.
 
 As a next step, the following resources are available:
 
-* [Documentation](/docs/index.html) - The documentation is an in-depth reference
+* [Documentation](/docs/index.html.markdown) - The documentation is an in-depth reference
   guide to all the features of Serf, including technical details about the
   internals of how Serf operates.
 

docs/intro/getting-started/queries.html.markdown

@@ -44,7 +44,7 @@ the current load average of the machine.
 
 Serf agents must be configured to handle queries before they will
 respond to them. See the "Specifying Event Handlers" section in the
-[Event Handlers documentation](/docs/agent/event-handlers.html) for
+[Event Handlers documentation](/docs/agent/event-handlers.html.markdown) for
 examples of the configuration format.
 
 ## Query Payloads

docs/intro/getting-started/user-events.html.markdown

@@ -68,7 +68,7 @@ Custom events come with some trade-offs, however:
 * Events are eventually consistent: Because events are delivered over
   gossip, the messages _eventually_ arrive at every node. In theory
   (and anecdotally in practice), the state of the cluster
-  [converges rapidly](/docs/internals/simulator.html).
+  [converges rapidly](/docs/internals/simulator.html.markdown).
 
 * Payload size is limited: Serf gossips via UDP, so the payload must fit
   within a single UDP packet (alongside any other data Serf sends). This

docs/intro/index.html.markdown

@@ -11,7 +11,7 @@ description: |-
 Welcome to the intro guide to Serf! This guide will show you what Serf is,
 explain the problems Serf solves, compare Serf versus other similar
 software, and show how easy it is to actually use Serf. If you're already familiar
-with the basics of Serf, the [documentation](/docs/index.html) provides more
+with the basics of Serf, the [documentation](/docs/index.html.markdown) provides more
 of a reference for all available features.
 
 ## What is Serf?
@@ -22,7 +22,7 @@ highly available. Serf runs on every major platform: Linux, Mac OS X, and Window
 extremely lightweight: it uses 5 to 10 MB of resident memory and primarily
 communicates using infrequent UDP messages.
 
-Serf uses an efficient [gossip protocol](/docs/internals/gossip.html)
+Serf uses an efficient [gossip protocol](/docs/internals/gossip.html.markdown)
 to solve three major problems:
 
 * **Membership**: Serf maintains cluster membership lists and is able to
@@ -42,9 +42,9 @@ to solve three major problems:
   deliver messages in the face of offline nodes or network partitions. Queries
   provide a simple realtime request/response mechanism.
 
-See the [use cases page](/intro/use-cases.html) for a list of concrete use
+See the [use cases page](/docs/intro/use-cases.html.markdown) for a list of concrete use
 cases built on top of the features Serf provides. See the page on
-[how Serf compares to other software](/intro/vs-other-sw.html) to see just
+[how Serf compares to other software](/docs/intro/vs-other-sw.html.markdown) to see just
 how it fits into your existing infrastructure. Or continue onwards with
-the [getting started guide](/intro/getting-started/install.html) to get
+the [getting started guide](/docs/intro/getting-started/install.html.markdown) to get
 Serf up and running and see how it works.

docs/intro/use-cases.html.markdown

@@ -8,7 +8,7 @@ description: |-
 
 # Use Cases
 
-At this point you should know [what Serf is](/intro/index.html) and
+At this point you should know [what Serf is](/docs/intro/index.html.markdown) and
 the high-level features Serf provides. This page lists a handful of
 concrete use cases of Serf. Note that this list is not exhaustive by
 any means. Serf is a general purpose tool and has infinitely many more

docs/intro/vs-consul.html.markdown

@@ -37,7 +37,7 @@ Catalog, while Serf is only eventually consistent.
 In addition to the service level abstraction and improved health checking,
 Consul provides a key/value store and support for multiple datacenters.
 Serf can run across the WAN but with degraded performance. Consul makes use
-of [multiple gossip pools](https://www.consul.io/docs/internals/architecture.html),
+of [multiple gossip pools](https://www.consul.io/docs/internals/architecture.html.markdown),
 so that the performance of Serf over a LAN can be retained while still using it over
 a WAN for linking together multiple datacenters.
 

docs/recipes.html.markdown

@@ -17,8 +17,8 @@ request.
 
 ---
 
-* [Event handler router](/docs/recipes/event-handler-router.html) - Provides
+* [Event handler router](/docs/recipes/event-handler-router.html.markdown) - Provides
   dynamic event handler configuration using a simple shell script.
 
-* [Get agent uptime](/docs/recipes/agent-uptime.html) - Expose the elapsed time
+* [Get agent uptime](/docs/recipes/agent-uptime.html.markdown) - Expose the elapsed time
   since startup of a Serf agent.

docs/recipes/event-handler-router.html.markdown

@@ -9,7 +9,7 @@ description: |-
 # Recipe: Event handler router
 
 Typically you must configure a handler for each type of event you expect to
-encounter (more about events and handlers [here](/docs/agent/event-handlers.html)).
+encounter (more about events and handlers [here](/docs/agent/event-handlers.html.markdown)).
 To change handler configuration, one must update the Serf configuration and reload
 the agent with a SIGHUP or a restart.
 

docs/upgrading.html.markdown

@@ -33,7 +33,7 @@ below, assume you're running version A of Serf, and then version B comes out.
    You can verify this is the case by running `serf members -detailed` to
    make sure all members are speaking the same, latest protocol version.
 
-The key to making this work is the [protocol compatibility](/docs/compatibility.html)
+The key to making this work is the [protocol compatibility](/docs/compatibility.html.markdown)
 of Serf. The protocol version system is discussed below.
 
 ## Protocol Versions