♻️ 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-birb.js

@@ -1,23 +0,0 @@
-Prism.languages.birb = Prism.languages.extend('clike', {
-	'string': {
-		pattern: /r?("|')(?:\\.|(?!\1)[^\\])*\1/,
-		greedy: true
-	},
-	'class-name': [
-		/\b[A-Z](?:[\d_]*[a-zA-Z]\w*)?\b/,
-
-		// matches variable and function return types (parameters as well).
-		/\b(?:[A-Z]\w*|(?!(?:var|void)\b)[a-z]\w*)(?=\s+\w+\s*[;,=()])/
-	],
-	'keyword': /\b(?:assert|break|case|class|const|default|else|enum|final|follows|for|grab|if|nest|new|next|noSeeb|return|static|switch|throw|var|void|while)\b/,
-	'operator': /\+\+|--|&&|\|\||<<=?|>>=?|~(?:\/=?)?|[+\-*\/%&^|=!<>]=?|\?|:/,
-	'variable': /\b[a-z_]\w*\b/,
-});
-
-Prism.languages.insertBefore('birb', 'function', {
-	'metadata': {
-		pattern: /<\w+>/,
-		greedy: true,
-		alias: 'symbol'
-	}
-});