♻️ 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

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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-idris.js

@@ -1,19 +0,0 @@
-Prism.languages.idris = Prism.languages.extend('haskell', {
-	'comment': {
-		pattern: /(?:(?:--|\|\|\|).*$|\{-[\s\S]*?-\})/m,
-	},
-	'keyword': /\b(?:Type|case|class|codata|constructor|corecord|data|do|dsl|else|export|if|implementation|implicit|import|impossible|in|infix|infixl|infixr|instance|interface|let|module|mutual|namespace|of|parameters|partial|postulate|private|proof|public|quoteGoal|record|rewrite|syntax|then|total|using|where|with)\b/,
-	'builtin': undefined
-});
-
-Prism.languages.insertBefore('idris', 'keyword', {
-	'import-statement': {
-		pattern: /(^\s*import\s+)(?:[A-Z][\w']*)(?:\.[A-Z][\w']*)*/m,
-		lookbehind: true,
-		inside: {
-			'punctuation': /\./
-		}
-	}
-});
-
-Prism.languages.idr = Prism.languages.idris;