Move 11 documentation sections to separate markdown files in docs/:
- models.md, load-balancing.md, web-console.md, configuration.md
- menubar-app.md, api-endpoints.md, testing.md, troubleshooting.md
- safety-notices.md, legal.md, development.md
README now contains a Documentation section with links to each doc.
Also moved donation link to above Star History section.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
