docs(CONTRIBUTING): add standalone release section (#5946)

* docs: update section in troubleshooting

* docs: add section on standalone release

docs/CONTRIBUTING.md

@@ -11,6 +11,7 @@
   - [Version updates to Code](#version-updates-to-code)
   - [Patching Code](#patching-code)
   - [Build](#build)
+    - [Creating a Standalone Release](#creating-a-standalone-release)
   - [Troubleshooting](#troubleshooting)
     - [I see "Forbidden access" when I load code-server in the browser](#i-see-forbidden-access-when-i-load-code-server-in-the-browser)
     - ["Can only have one anonymous define call per script"](#can-only-have-one-anonymous-define-call-per-script)
@@ -170,6 +171,22 @@ yarn package
 > If you need your builds to support older distros, run the build commands
 > inside a Docker container with all the build requirements installed.
 
+#### Creating a Standalone Release
+
+Part of the build process involves creating standalone releases. At the time of
+writing, we do this for the following platforms/architectures:
+
+- Linux amd64 (.tar.gz, .deb, and .rpm)
+- Linux arm64 (.tar.gz, .deb, and .rpm)
+- Linux arm7l (.tar.gz)
+- Linux armhf.deb
+- Linux armhf.rpm
+- macOS amd64 (Intel-based)
+
+Currently, these are compiled in CI using the `yarn release-standalone` command
+in the `release.yaml` workflow. We then upload them to the draft release and
+distribute via GitHub Releases.
+
 ### Troubleshooting
 
 #### I see "Forbidden access" when I load code-server in the browser
@@ -178,7 +195,7 @@ This means your patches didn't apply correctly. We have a patch to remove the au
 
 Try popping off the patches with `quilt pop -a` and reapplying with `quilt push -a`.
 
-### "Can only have one anonymous define call per script"
+#### "Can only have one anonymous define call per script"
 
 Code might be trying to use a dev or prod HTML in the wrong context. You can try re-running code-server and setting `VSCODE_DEV=1`.