docs(root): fix stale references and document sandbox workflow (#1464)

Co-authored-by: Claude <noreply@anthropic.com>

packages/cli/README.md

@@ -0,0 +1,63 @@
+# @videojs/cli
+
+[![package-badge]][package]
+
+> **⚠️ Beta** Experimental adoption in real projects.
+
+The Video.js 10 CLI. Read documentation from your terminal and generate installation snippets tailored to your setup (framework, preset, skin, media engine, package manager).
+
+## Install
+
+Run without installing:
+
+```bash
+npx @videojs/cli --help
+```
+
+Or install globally:
+
+```bash
+npm install -g @videojs/cli
+videojs --help
+```
+
+> Scripts below use `videojs` for brevity — substitute `npx @videojs/cli` if you don't install globally.
+
+## Examples
+
+Read a doc page:
+
+```bash
+videojs docs concepts/overview
+```
+
+Generate a framework-specific installation snippet interactively:
+
+```bash
+videojs docs how-to/installation \
+  --framework react \
+  --preset video \
+  --skin default \
+  --media hls \
+  --install-method pnpm \
+  --source-url https://example.com/video.m3u8
+```
+
+For full usage, run `videojs --help`, `videojs docs --help`, or `videojs config --help`.
+
+## Community
+
+If you need help with anything related to Video.js 10, or if you'd like to casually chat with other
+members:
+
+- [Join Discord Server][discord]
+- [See GitHub Discussions][gh-discussions]
+
+## License
+
+[Apache-2.0](./LICENSE)
+
+[package]: https://www.npmjs.com/package/@videojs/cli
+[package-badge]: https://img.shields.io/npm/v/@videojs/cli?label=@videojs/cli
+[discord]: https://discord.gg/JBqHh485uF
+[gh-discussions]: https://github.com/videojs/v10/discussions