Update README.md's usage instructions for forklift v0.7

Author: ethanjli

README.md

@@ -21,29 +21,29 @@ that currently `forklift` is only tested for Linux computers.
 
 ### Deployment
 
-You can clone the latest commit of this Forklift pallet to your computer, by
-using the `forklift` tool:
-```
-forklift plt clone github.com/PlanktoScope/pallet-segmenter@main
-```
+The instructions below assume that you are using a version of the `forklift` tool which is greater
+than or equal to v0.7.0 (but less than v0.8.0, which has not yet been released yet); other versions
+of the `forklift` tool may behave differently and thus may require different commands than what is
+described below:
+
+#### First-time deployment
 
-Then you can apply the cloned pallet on your computer using the following sequence of `forklift`
-CLI commands:
+You can clone, stage, and apply the latest commit of this Forklift pallet to your computer, by
+using the `forklift` tool:
 ```
-forklift plt cache-repo
-sudo -E forklift plt apply
+sudo -E forklift pallet switch --apply github.com/PlanktoScope/pallet-segmenter@edge
 ```
 
 Warning: this will replace all Docker containers on your Docker host with the package deployments
 specified by this pallet and delete any Docker containers not specified by this pallet's package
 deployments.
 
 If your user is [in the `docker` group](https://docs.docker.com/engine/install/linux-postinstall/#manage-docker-as-a-non-root-user)
-(so that you don't need to use `sudo` when running `docker`
-commands), then you can just run a single command instead of the three commands listed above:
+(so that you don't need to use `sudo` when running `docker` commands), then you can avoid using
+`sudo` with the `forklift` command:
 
 ```
-forklift plt switch github.com/PlanktoScope/pallet-segmenter@main
+forklift pallet switch --apply github.com/PlanktoScope/pallet-segmenter@edge
 ```
 
 Then you can access the Node-RED dashboard from your web browser at
@@ -58,6 +58,22 @@ The simplest way to add input datasets and download EcoTaxa export archives (wor
 with file permissions between your user account and the `root` user used for running the segmenter)
 will be to use the filebrowser in your web browser, at <http://localhost:9000>.
 
+#### Subsequent deployment
+
+Because the `forklift` tool uses [Docker Compose](https://docs.docker.com/compose/) to manage the
+Docker containers specified by this pallet, the containers will not run after the next time you
+restart your computer; you will need to run a command to start the containers again:
+
+```
+sudo -E forklift stage apply
+```
+
+Or if your user is in the `docker` group:
+
+```
+forklift stage apply
+```
+
 ### Forking
 
 To make your own copy of this repository for experimentation, you should fork this repository to a