♻️ 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/common-ancestor-path/index.js

@@ -1,17 +0,0 @@
-const {parse, sep, normalize: norm} = require('path')
-
-function* commonArrayMembers (a, b) {
-  const [l, s] = a.length > b.length ? [a, b] : [b, a]
-  for (const x of s) {
-    if (x === l.shift())
-      yield x
-    else
-      break
-  }
-}
-
-const commonAncestorPath = (a, b) => a === b ? a
-  : parse(a).root !== parse(b).root ? null
-  : [...commonArrayMembers(norm(a).split(sep), norm(b).split(sep))].join(sep)
-
-module.exports = (...paths) => paths.reduce(commonAncestorPath)