♻️ 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/plugins/highlight-keywords/prism-highlight-keywords.js

@@ -1,14 +0,0 @@
-(function () {
-
-	if (typeof Prism === 'undefined') {
-		return;
-	}
-
-	Prism.hooks.add('wrap', function (env) {
-		if (env.type !== 'keyword') {
-			return;
-		}
-		env.classes.push('keyword-' + env.content);
-	});
-
-}());