♻️ 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/postcss/lib/comment.js

@@ -1,13 +0,0 @@
-'use strict'
-
-let Node = require('./node')
-
-class Comment extends Node {
-  constructor(defaults) {
-    super(defaults)
-    this.type = 'comment'
-  }
-}
-
-module.exports = Comment
-Comment.default = Comment