index.html: Elffuss now lives on elffuss.com (links only)

Sync with the current Elffuss Code: edits instead of rewrites, context that fits, multilingual retrieval; README refresh

Fix the brain that stopped loading, plus workspace, Hard Work and i18n

Sync with production: full i18n (EN/ES), English metadata, 15-min challenge banner

English title + meta description

Elffuss Code — browser IDE with a local AI agent (WebGPU)

initial commit