Add periodic cache refresh for leaderboard data

Change blue links and text to dark grey (#555555)

Update DeepSeek logo, tooltip format, and category names

Fix data plotting requirements and server port handling; ensure per-benchmark plots use correct agent column.\n\n- Respect HOST/PORT env for local runs\n- Use 'OpenHands Version' in plot requirements\n- Avoid plotting when use_plotly=False\n\nCo-authored-by: openhands <openhands@all-hands.dev>

Force rebuild: Trigger HuggingFace Space to fetch latest data from GitHub

Cleanup codebase: remove unused code, simplify data loading, and add pre-release notice

Remove submission page and add submission instructions to About page

Update category structure to OpenHands Index with 5 categories

Add verbose logging and include JSONL data files

Add comprehensive error handling and timeout protection

Fix data loading: fetch from GitHub with fallback to mock data

Fix runtime errors and data loading

Convert to JSONL data format and remove agent-eval dependency

Initial OpenHands Index leaderboard based on ASTA Bench