♻️ 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/property-information/lib/xlink.js

@@ -1,17 +0,0 @@
-import {create} from './util/create.js'
-
-export const xlink = create({
-  properties: {
-    xLinkActuate: null,
-    xLinkArcRole: null,
-    xLinkHref: null,
-    xLinkRole: null,
-    xLinkShow: null,
-    xLinkTitle: null,
-    xLinkType: null
-  },
-  space: 'xlink',
-  transform(_, property) {
-    return 'xlink:' + property.slice(5).toLowerCase()
-  }
-})