Revert to plain markdown README; link out to standalone dataset-explorer Space

Embed dataset-explorer via iframe (JS runs in its own context) (#4)

Bundle D3 + GSAP locally, move inline script to app.js (#3)

Inline hero PNG (drop LFS; 3.5MB -> 43KB) (#2)

Deploy interactive dataset explorer (static SDK) (#1)

Update README.md

initial commit