♻️ 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.min.js

@@ -1 +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:void 0}),Prism.languages.insertBefore("idris","keyword",{"import-statement":{pattern:/(^\s*import\s+)(?:[A-Z][\w']*)(?:\.[A-Z][\w']*)*/m,lookbehind:!0,inside:{punctuation:/\./}}}),Prism.languages.idr=Prism.languages.idris;