Rename: vaporwave -> stellate (repo, GitHub, nginx deploy path)

Project renamed to "stellate". Repo dir /home/ford/vaporwave -> /home/ford/stellate, GitHub ftrain/vaporwave -> ftrain/stellate, and nginx now serves aboardresearch.com/projects/stellate/ (COOP/COEP preserved); the old /projects/vaporwave/ path 301-redirects here so every prior link resolves.

▶ Play it: Food Court Eternity — parked on the genre this change names https://stellate.app/?genre=vaporwave&seed=7958&path=1679.4393,1698.4426,1660.4426&xdur=13.122

f4ec976 https://github.com/aboard-io/stellate/commit/f4ec97663b68c26f69e3587f1545d12e2fd183ea