0.1.0

refactor: simplify distribution now that the repo is public (#12)

With the repo public, GitHub release assets are directly downloadable, so the
token/fetch indirection is no longer needed.

- Remove web/scripts/fetch-installer.mjs and the vercel-build hook.
- Download button links straight to the GitHub release CDN.
- electron-builder: stable version-less asset name (Youloader-Setup.exe) so
  /releases/latest/download/Youloader-Setup.exe always points at the newest
  build and the button never needs updating.
- Drop the gitignore entry; update RELEASING.md for the simpler flow.