chore: reorganize docs apps (#7228)

* reorganize docs apps

* add README

* fix directory

* add condition for old docs

www/packages/build-scripts/package.json

@@ -0,0 +1,43 @@
+{
+  "name": "build-scripts",
+  "version": "0.0.0",
+  "private": true,
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "type": "module",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "module": "./dist/index.js",
+  "exports": {
+    ".": {
+      "import": {
+        "types": "./dist/index.d.ts",
+        "default": "./dist/index.js"
+      }
+    }
+  },
+  "sideEffects": false,
+  "files": [
+    "dist/**"
+  ],
+  "scripts": {
+    "build": "yarn clean && tsc",
+    "clean": "rimraf dist"
+  },
+  "dependencies": {
+    "remark-rehype-plugins": "*"
+  },
+  "devDependencies": {
+    "@types/node": "^20.11.20",
+    "eslint-config-docs": "*",
+    "rimraf": "^5.0.5",
+    "tsconfig": "*",
+    "types": "*",
+    "typescript": "^5.3.3"
+  },
+  "engines": {
+    "node": ">=18.17.0"
+  }
+}