♻️ 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-linker-script.js

@@ -1,30 +0,0 @@
-Prism.languages['linker-script'] = {
-	'comment': {
-		pattern: /(^|\s)\/\*[\s\S]*?(?:$|\*\/)/,
-		lookbehind: true,
-		greedy: true
-	},
-	'identifier': {
-		pattern: /"[^"\r\n]*"/,
-		greedy: true
-	},
-
-	'location-counter': {
-		pattern: /\B\.\B/,
-		alias: 'important'
-	},
-
-	'section': {
-		pattern: /(^|[^\w*])\.\w+\b/,
-		lookbehind: true,
-		alias: 'keyword'
-	},
-	'function': /\b[A-Z][A-Z_]*(?=\s*\()/,
-
-	'number': /\b(?:0[xX][a-fA-F0-9]+|\d+)[KM]?\b/,
-
-	'operator': />>=?|<<=?|->|\+\+|--|&&|\|\||::|[?:~]|[-+*/%&|^!=<>]=?/,
-	'punctuation': /[(){},;]/
-};
-
-Prism.languages['ld'] = Prism.languages['linker-script'];