♻️ 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-json.js

@@ -1,27 +0,0 @@
-// https://www.json.org/json-en.html
-Prism.languages.json = {
-	'property': {
-		pattern: /(^|[^\\])"(?:\\.|[^\\"\r\n])*"(?=\s*:)/,
-		lookbehind: true,
-		greedy: true
-	},
-	'string': {
-		pattern: /(^|[^\\])"(?:\\.|[^\\"\r\n])*"(?!\s*:)/,
-		lookbehind: true,
-		greedy: true
-	},
-	'comment': {
-		pattern: /\/\/.*|\/\*[\s\S]*?(?:\*\/|$)/,
-		greedy: true
-	},
-	'number': /-?\b\d+(?:\.\d+)?(?:e[+-]?\d+)?\b/i,
-	'punctuation': /[{}[\],]/,
-	'operator': /:/,
-	'boolean': /\b(?:false|true)\b/,
-	'null': {
-		pattern: /\bnull\b/,
-		alias: 'keyword'
-	}
-};
-
-Prism.languages.webmanifest = Prism.languages.json;