[refactor] redesign & rewrite Hackathon home page#59

TechQuery merged 14 commits intoOpen-Source-Bazaar:mainOpen-Source-Bazaar/Open-Source-Bazaar.github.io:mainfrom

lichang333:codex/static-hackathon-niuma-2026lichang333/Open-Source-Bazaar.github.io:codex/static-hackathon-niuma-2026Copy head branch name to clipboard