♻️ 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
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✅ 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-firestore-security-rules.js

@@ -1,35 +0,0 @@
-Prism.languages['firestore-security-rules'] = Prism.languages.extend('clike', {
-	'comment': /\/\/.*/,
-	'keyword': /\b(?:allow|function|if|match|null|return|rules_version|service)\b/,
-	'operator': /&&|\|\||[<>!=]=?|[-+*/%]|\b(?:in|is)\b/,
-});
-
-delete Prism.languages['firestore-security-rules']['class-name'];
-
-Prism.languages.insertBefore('firestore-security-rules', 'keyword', {
-	'path': {
-		pattern: /(^|[\s(),])(?:\/(?:[\w\xA0-\uFFFF]+|\{[\w\xA0-\uFFFF]+(?:=\*\*)?\}|\$\([\w\xA0-\uFFFF.]+\)))+/,
-		lookbehind: true,
-		greedy: true,
-		inside: {
-			'variable': {
-				pattern: /\{[\w\xA0-\uFFFF]+(?:=\*\*)?\}|\$\([\w\xA0-\uFFFF.]+\)/,
-				inside: {
-					'operator': /=/,
-					'keyword': /\*\*/,
-					'punctuation': /[.$(){}]/
-				}
-			},
-			'punctuation': /\//
-		}
-	},
-	'method': {
-		// to make the pattern shorter, the actual method names are omitted
-		pattern: /(\ballow\s+)[a-z]+(?:\s*,\s*[a-z]+)*(?=\s*[:;])/,
-		lookbehind: true,
-		alias: 'builtin',
-		inside: {
-			'punctuation': /,/
-		}
-	},
-});