♻️ 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-tsx.js

@@ -1,15 +0,0 @@
-(function (Prism) {
-	var typescript = Prism.util.clone(Prism.languages.typescript);
-	Prism.languages.tsx = Prism.languages.extend('jsx', typescript);
-
-	// doesn't work with TS because TS is too complex
-	delete Prism.languages.tsx['parameter'];
-	delete Prism.languages.tsx['literal-property'];
-
-	// This will prevent collisions between TSX tags and TS generic types.
-	// Idea by https://github.com/karlhorky
-	// Discussion: https://github.com/PrismJS/prism/issues/2594#issuecomment-710666928
-	var tag = Prism.languages.tsx.tag;
-	tag.pattern = RegExp(/(^|[^\w$]|(?=<\/))/.source + '(?:' + tag.pattern.source + ')', tag.pattern.flags);
-	tag.lookbehind = true;
-}(Prism));