♻️ 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-erb.js

@@ -1,25 +0,0 @@
-(function (Prism) {
-
-	Prism.languages.erb = {
-		'delimiter': {
-			pattern: /^(\s*)<%=?|%>(?=\s*$)/,
-			lookbehind: true,
-			alias: 'punctuation'
-		},
-		'ruby': {
-			pattern: /\s*\S[\s\S]*/,
-			alias: 'language-ruby',
-			inside: Prism.languages.ruby
-		}
-	};
-
-	Prism.hooks.add('before-tokenize', function (env) {
-		var erbPattern = /<%=?(?:[^\r\n]|[\r\n](?!=begin)|[\r\n]=begin\s(?:[^\r\n]|[\r\n](?!=end))*[\r\n]=end)+?%>/g;
-		Prism.languages['markup-templating'].buildPlaceholders(env, 'erb', erbPattern);
-	});
-
-	Prism.hooks.add('after-tokenize', function (env) {
-		Prism.languages['markup-templating'].tokenizePlaceholders(env, 'erb');
-	});
-
-}(Prism));