♻️ 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

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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/which-pm-runs/package.json

@@ -1,42 +0,0 @@
-{
-  "name": "which-pm-runs",
-  "version": "1.1.0",
-  "description": "Detects what package manager executes the process",
-  "main": "index.js",
-  "files": [
-    "index.js"
-  ],
-  "engines": {
-    "node": ">=4"
-  },
-  "repository": "https://github.com/zkochan/packages/tree/main/which-pm-runs",
-  "bugs": {
-    "url": "https://github.com/zkochan/packages/labels/package%3A%20which-pm-runs"
-  },
-  "keywords": [
-    "npm",
-    "pnpm",
-    "yarn",
-    "cnpm"
-  ],
-  "author": "Zoltan Kochan",
-  "license": "MIT",
-  "homepage": "https://github.com/zkochan/packages/tree/main/which-pm-runs#readme",
-  "dependenciesMeta": {
-    "which-pm-runs": {
-      "injected": true
-    }
-  },
-  "devDependencies": {
-    "cnpm": "^7.1.1",
-    "execa": "^5.1.1",
-    "npm": "^8.2.0",
-    "pnpm": "^6.23.6",
-    "tape": "^5.3.2",
-    "which-pm-runs": "file:",
-    "yarn": "^1.22.17"
-  },
-  "scripts": {
-    "test": "tape test"
-  }
-}