The site.yml workflow deploys on push to main, so the site only goes live once
site/ is on main. Bring site/index.html + icons + the workflow so a GitHub
Pages deploy (Settings -> Pages -> Source: GitHub Actions) publishes it at
justvugg.github.io/colibri.
Refs #424
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>