feat: mintlify docs with interactive demo (#32)

- Rename mint.json to docs.json (current Mintlify CLI requirement)
- Update config to current schema: theme, navigation dropdowns, navbar
- Add interactive LogoSoupDemo component with real normalized values
  from createLogoSoup() running in a browser, toggle on/off, logo count slider
- Add FrameworkGrid component using svgl logos for React, Vue, Svelte,
  Solid, Angular, jQuery, Vanilla JS, and custom adapter
- Add favicon, logo SVGs, before/after images
- Merge API Reference into main dropdown, drop standalone Types page
- Add docs/docs:build scripts to package.json

Author: RostiMelk