feat: migrate hosting to Cloudflare Pages via git.ampbox.io

- Update site URL to https://crashtestdev.com, remove /crashtestdev base path
- Add Gitea Actions workflow for Cloudflare Pages deployment
- Remove GitHub Actions workflows (GitHub Pages + legacy Azure SWA)
- Update tests to match new site config

🤖 Generated with [Amplifier](https://github.com/microsoft/amplifier)

Co-Authored-By: Amplifier <240397093+microsoft-amplifier@users.noreply.github.com>

tests/check-navbar.mjs

@@ -116,7 +116,7 @@ if (existsSync(resolve('src/pages/index.astro'))) {
 // ── Build output checks ──
 console.log('\n--- Build output checks ---');
 
-assert(existsSync(indexPath), 'dist/crashtestdev/index.html exists');
+assert(existsSync(indexPath), 'dist/index.html exists');
 
 if (existsSync(indexPath)) {
   const html = readFileSync(indexPath, 'utf-8');