Update readme.md to link to MD docs

[Ticket](https://app.asana.com/0/1207142155269470/1207142155269478/f)

README.md

@@ -1,6 +1,6 @@
 # Serf [![Build Status](https://github.com/hashicorp/serf/workflows/Checks/badge.svg)](https://github.com/hashicorp/serf/actions) [![Join the chat at https://gitter.im/hashicorp-serf/Lobby](https://badges.gitter.im/hashicorp-serf/Lobby.svg)](https://gitter.im/hashicorp-serf/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
-* Website: https://www.serf.io
+* Website: https://github.com/hashicorp/serf
 * Chat: [Gitter](https://gitter.im/hashicorp-serf/Lobby)
 * Mailing list: [Google Groups](https://groups.google.com/group/serfdom/)
 
@@ -28,7 +28,7 @@ Here are some example use cases of Serf, though there are many others:
 
 ## Quick Start
 
-First, [download a pre-built Serf binary](https://www.serf.io/downloads.html)
+First, [download a pre-built Serf binary](https://github.com/hashicorp/serf)
 for your operating system, [compile Serf yourself](#developing-serf), or install
 using `go get -u github.com/hashicorp/serf/cmd/serf`.
 
@@ -88,7 +88,7 @@ cluster of the node failure.
 
 Full, comprehensive documentation is viewable on the Serf website:
 
-https://www.serf.io/docs
+https://github.com/hashicorp/serf/docs
 
 ## Developing Serf
 

demo/vagrant-cluster/README.md

@@ -24,4 +24,4 @@ At this point the two nodes are running and you can SSH in to play with them:
     ...
 
 To learn more about starting serf, joining nodes and interacting with the agent,
-checkout the [getting started guide](https://www.serf.io/intro/getting-started/install.html).
+checkout the [getting started guide](https://github.com/hashicorp/serf/docs/intro/getting-started/install.html).