♻️ 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/postcss/lib/document.js

@@ -1,33 +0,0 @@
-'use strict'
-
-let Container = require('./container')
-
-let LazyResult, Processor
-
-class Document extends Container {
-  constructor(defaults) {
-    // type needs to be passed to super, otherwise child roots won't be normalized correctly
-    super({ type: 'document', ...defaults })
-
-    if (!this.nodes) {
-      this.nodes = []
-    }
-  }
-
-  toResult(opts = {}) {
-    let lazy = new LazyResult(new Processor(), this, opts)
-
-    return lazy.stringify()
-  }
-}
-
-Document.registerLazyResult = dependant => {
-  LazyResult = dependant
-}
-
-Document.registerProcessor = dependant => {
-  Processor = dependant
-}
-
-module.exports = Document
-Document.default = Document