♻️ 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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✅ 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/stringify.js

@@ -1,11 +0,0 @@
-'use strict'
-
-let Stringifier = require('./stringifier')
-
-function stringify(node, builder) {
-  let str = new Stringifier(builder)
-  str.stringify(node)
-}
-
-module.exports = stringify
-stringify.default = stringify