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.

website/docs.ts

@@ -166,6 +166,14 @@ const develop = pairedPages([
     section: { root: '基础', en: 'Basics' },
     order: 3,
   },
+  {
+    source: 'docs/user/develop/basic/publish.md',
+    route: 'develop/basic/publish.md',
+    label: { root: '打包与安装插件', en: 'Package and install' },
+    sidebar: { root: 'zh-develop', en: 'en-develop' },
+    section: { root: '基础', en: 'Basics' },
+    order: 4,
+  },
   {
     source: 'docs/user/develop/framework/index.md',
     route: 'develop/framework/index.md',