HACS README refresh.
- Republished the README updates in a new release so Home Assistant/HACS can pull the fixed logo, screenshots, personal project background, and Dashboard wording instead of older cached 5.1.0 content.
- Bumped the package/card version to 5.1.2 and rebuilt dist.
Verification:
- npm run build
- npm run lint (warnings only)
- npm test: 60 passed
- node --check src/homeii-music-flow.js
- node --check dist/homeii-music-flow.js
- README raw image URLs return HTTP 200