feat: add GitHub Pages deployment — landing page + CI build workflow (#30)

- tools/render_index.py: generates artifacts/index.html — a beautiful dark-theme landing page presenting Tour de Force and Domain Registry as two CTA cards, with a feature strip and nav linking to GitHub and the plugin guide

- .github/workflows/pages.yml: on every push to main, runs tour_de_force.py → tour_de_force.html render_domain_registry.py → domain_registry.html render_index.py → index.html then deploys all three to GitHub Pages via actions/deploy-pages@v4

- GitHub Pages enabled at https://cgcardona.github.io/muse/ (source: Actions)

Co-authored-by: Gabriel Cardona <gabriel@tellurstori.com>