♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

✅ 11 pages built successfully
✅ Cookie consent banner included
✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/prismjs/components/prism-cilkcpp.js

@@ -1,9 +0,0 @@
-Prism.languages.cilkcpp = Prism.languages.insertBefore('cpp', 'function', {
-	'parallel-keyword': {
-		pattern: /\bcilk_(?:for|reducer|s(?:cope|pawn|ync))\b/,
-		alias: 'keyword'
-	}
-});
-
-Prism.languages['cilk-cpp'] = Prism.languages['cilkcpp'];
-Prism.languages['cilk'] = Prism.languages['cilkcpp'];