♻️ 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/common-ancestor-path/package.json

@@ -1,28 +0,0 @@
-{
-  "name": "common-ancestor-path",
-  "version": "1.0.1",
-  "files": [
-    "index.js"
-  ],
-  "description": "Find the common ancestor of 2 or more paths on Windows or Unix",
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/isaacs/common-ancestor-path"
-  },
-  "author": "Isaac Z. Schlueter <i@izs.me> (https://izs.me)",
-  "license": "ISC",
-  "scripts": {
-    "test": "tap",
-    "snap": "tap",
-    "preversion": "npm test",
-    "postversion": "npm publish",
-    "prepublishOnly": "git push origin --follow-tags"
-  },
-  "tap": {
-    "check-coverage": true
-  },
-  "devDependencies": {
-    "require-inject": "^1.4.4",
-    "tap": "^14.10.7"
-  }
-}