♻️ 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/warn-once.js

@@ -1,13 +0,0 @@
-/* eslint-disable no-console */
-'use strict'
-
-let printed = {}
-
-module.exports = function warnOnce(message) {
-  if (printed[message]) return
-  printed[message] = true
-
-  if (typeof console !== 'undefined' && console.warn) {
-    console.warn(message)
-  }
-}