chore: reorganize docs apps (#7228)

* reorganize docs apps

* add README

* fix directory

* add condition for old docs

www/apps/api-reference/package.json

@@ -17,7 +17,7 @@
     "@mdx-js/react": "^3.0.0",
     "@medusajs/icons": "^1.2.0",
     "@medusajs/ui": "^2.4.1",
-    "@next/mdx": "14.1.3",
+    "@next/mdx": "14.2.3",
     "@readme/openapi-parser": "^2.5.0",
     "@types/mapbox__rehype-prism": "^0.8.0",
     "@types/mdx": "^2.0.5",
@@ -32,7 +32,7 @@
     "jsdom": "^22.1.0",
     "json-schema": "^0.4.0",
     "json-stringify-pretty-compact": "^4.0.0",
-    "next": "^14.1.3",
+    "next": "^14.2.3",
     "next-mdx-remote": "^4.4.1",
     "openapi-sampler": "^1.3.1",
     "openapi-types": "^12.1.3",
@@ -52,7 +52,7 @@
     "yaml": "^2.3.1"
   },
   "devDependencies": {
-    "@next/bundle-analyzer": "^14.1.3",
+    "@next/bundle-analyzer": "^14.2.3",
     "@types/jsdom": "^21.1.1",
     "types": "*"
   },