Replace the original upstream template README (public-project framing,
roadmap items already built, links to a different GitHub repo) with
documentation matching the actual private deployment: real
docker-compose.yml, the Gitea->Dockhand rebuild-on-push behavior, env
vars/CLI flags, data file locations, and the full current feature set
(theming, notes hub, video duration/ffprobe caching, backup export,
Outline integration) that had never been documented.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>