docs: tutorial for packaging and installing a plugin bundle

Adds docs/user/develop/basic/publish.md (+ zh pair, website entry) to the
basics path: the bundle-vs-profile manifest split, dsh plugin add into a
profile, the five-layer loading order, and the GitHub-install build-script
catch — git specs ship sources, so the author owns a self-contained prepare
script and the user owns an allowBuilds allowance that is install-time code
execution; built tarballs and npm need neither.

docs/user/develop/basic/config.md

@@ -101,5 +101,6 @@ A configuration edit hot-replaces the plugin: the framework unloads the old inst
 
 ## Next steps
 
+- [Package and install a plugin](./publish.md) — ship the plugin as an installable package
 - [Plugins and lifecycle](../framework/) — understand the full plugin lifecycle
 - [Services and dependencies](../framework/service.md) — provide a service to other plugins