♻️ 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-nand2tetris-hdl.js

@@ -1,9 +0,0 @@
-Prism.languages['nand2tetris-hdl'] = {
-	'comment': /\/\/.*|\/\*[\s\S]*?(?:\*\/|$)/,
-	'keyword': /\b(?:BUILTIN|CHIP|CLOCKED|IN|OUT|PARTS)\b/,
-	'boolean': /\b(?:false|true)\b/,
-	'function': /\b[A-Za-z][A-Za-z0-9]*(?=\()/,
-	'number': /\b\d+\b/,
-	'operator': /=|\.\./,
-	'punctuation': /[{}[\];(),:]/
-};