- Copy Astro landing page source into docs/website/ (20K, no node_modules)
- Add ISO version badge to LandingBody.astro (only shown when
ASTRO_ISO_VERSION is set during build)
- Add build_and_stage_docs() to build.sh: builds the Astro site with
the ISO version, stages output at /usr/local/share/clawdie-iso/docs/
- Skips gracefully when node/npm unavailable
- On the booted USB: open docs/index.html to see version-matched docs
