fix: show stats immediately with current values, live update in background

feat: complete rewrite — professional landing page with live stats, registry cards, accurate content

fix: switch Space to static landing

fix: pin huggingface_hub for gradio compatibility

fix: shorten Space metadata description

fix: convert Space into CROVIA Start Here landing

Update README.md

docs: add direct Hubble dataset link

docs: fix HF Space metadata and publish Crovia org card

docs: set Crovia organization card (Space README)

initial commit