♻️ 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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✅ 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/@shikijs/core/package.json

@@ -1,56 +0,0 @@
-{
-  "name": "@shikijs/core",
-  "type": "module",
-  "version": "3.23.0",
-  "description": "Core of Shiki",
-  "author": "Pine Wu <octref@gmail.com>; Anthony Fu <anthonyfu117@hotmail.com>",
-  "license": "MIT",
-  "homepage": "https://github.com/shikijs/shiki#readme",
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/shikijs/shiki.git",
-    "directory": "packages/core"
-  },
-  "bugs": "https://github.com/shikijs/shiki/issues",
-  "keywords": [
-    "shiki"
-  ],
-  "sideEffects": false,
-  "exports": {
-    ".": "./dist/index.mjs",
-    "./textmate": {
-      "types": "./dist/textmate.d.mts",
-      "default": "./dist/textmate.mjs"
-    },
-    "./types": {
-      "types": "./dist/types.d.mts"
-    },
-    "./dist/*": "./dist/*",
-    "./package.json": "./package.json",
-    "./*": "./dist/*"
-  },
-  "main": "./dist/index.mjs",
-  "module": "./dist/index.mjs",
-  "types": "./dist/index.d.mts",
-  "typesVersions": {
-    "*": {
-      "types": [
-        "./dist/types.d.mts"
-      ]
-    }
-  },
-  "files": [
-    "dist"
-  ],
-  "dependencies": {
-    "@shikijs/vscode-textmate": "^10.0.2",
-    "@types/hast": "^3.0.4",
-    "hast-util-to-html": "^9.0.5",
-    "@shikijs/types": "3.23.0"
-  },
-  "scripts": {
-    "build": "unbuild",
-    "dev": "unbuild --stub",
-    "test": "vitest"
-  }
-}