♻️ 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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✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/property-information/lib/normalize.js

@@ -1,12 +0,0 @@
-/**
- * Get the cleaned case insensitive form of an attribute or property.
- *
- * @param {string} value
- *   An attribute-like or property-like name.
- * @returns {string}
- *   Value that can be used to look up the properly cased property on a
- *   `Schema`.
- */
-export function normalize(value) {
-  return value.toLowerCase()
-}