Fixes#2 - Add website link to app footer
- Add VITE_WEBSITE_URL build arg for configurable website URL
- Add Git Repository and License links to app footer
- Update Join Free Alpha links to open in new tab (target=_blank)
- Removed docs/ (Starlight)
- Added www/ with pure HTML/CSS/JS landing page
- Product website with features, how it works, get started
- Basic HTML documentation pages (installation, quick start, AI providers)
- Dockerfile.docs now serves static files from www/
- Updated README and AGENTS.md