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>

astro.config.mjs

@@ -65,8 +65,7 @@ const workbenchTheme = {
 };
 
 export default defineConfig({
-  site: 'https://kenotron.github.io',
-  base: '/crashtestdev',
+  site: 'https://crashtestdev.com',
   integrations: [
     mdx(),
   ],