docs: give each service its own README

Move the code-server details into code-server/README.md and reduce the
root README to shared conventions plus a table linking to each service.

code-server/README.md

@@ -0,0 +1,28 @@
+# code-server
+
+[VS Code in the browser](https://github.com/linuxserver/docker-code-server),
+from the LinuxServer image, set up as a full remote dev box.
+
+Comes with Go, Node.js 24, Python 3, pnpm, and zsh via LinuxServer mods, plus
+`gh`, `git`, `ffmpeg`, `imagemagick`, and other CLI tools through
+`INSTALL_PACKAGES`. Git author/committer identity is injected from `.env`.
+
+## Environment
+
+| Variable | Purpose |
+| --- | --- |
+| `PASSWORD` | Web UI login, also the in-container sudo password. **A blank value disables authentication entirely.** |
+| `GIT_NAME` / `GIT_EMAIL` | Git author and committer identity |
+
+Generate a password with `openssl rand -base64 24`.
+
+## Networking
+
+Listens on `8443`. No ports are published — point the domain at that port in
+Coolify or Dokploy. See the [root README](../README.md) for why.
+
+## Storage
+
+Everything lives in the `code-server-config` named volume mounted at `/config`;
+the default workspace is `/config/workspace`. Removing the volume wipes your
+files, settings, and extensions.