Resolve GitHub Pages 404 by aligning deploy root and entrypoint paths

[Copilot]

The site was returning 404 on GitHub Pages because deployment published the repository root while the actual entrypoint lived under static/. In addition, index.html contained Flask template asset paths that do not resolve in static hosting.

• Deployment target correction

  • Updated Pages publish directory to ./static so the deployed artifact contains the actual index.html.

• Static hosting compatibility

  • Replaced Jinja/Flask url_for(...) asset references in static/index.html with relative static paths (css/..., js/...) so assets resolve when served directly by Pages.

• Local/server entrypoint parity

  • Changed Flask / route to serve static/index.html directly, keeping local runtime behavior consistent with the Pages artifact.

# .github/workflows/deploy.yml
with:
  github_token: ${{ secrets.GITHUB_TOKEN }}
  publish_dir: ./static