♻️ 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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✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/prismjs/components/prism-processing.js

@@ -1,15 +0,0 @@
-Prism.languages.processing = Prism.languages.extend('clike', {
-	'keyword': /\b(?:break|case|catch|class|continue|default|else|extends|final|for|if|implements|import|new|null|private|public|return|static|super|switch|this|try|void|while)\b/,
-	// Spaces are allowed between function name and parenthesis
-	'function': /\b\w+(?=\s*\()/,
-	'operator': /<[<=]?|>[>=]?|&&?|\|\|?|[%?]|[!=+\-*\/]=?/
-});
-
-Prism.languages.insertBefore('processing', 'number', {
-	// Special case: XML is a type
-	'constant': /\b(?!XML\b)[A-Z][A-Z\d_]+\b/,
-	'type': {
-		pattern: /\b(?:boolean|byte|char|color|double|float|int|[A-Z]\w*)\b/,
-		alias: 'class-name'
-	}
-});