chore(nuxt-demo): remove postinstall script from package.json

Author: honghuangdc

playground/nuxt-demo/package.json

@@ -6,7 +6,6 @@
     "build": "nuxt build",
     "dev": "nuxt dev",
     "generate": "nuxt generate",
-    "postinstall": "nuxt prepare",
     "preview": "nuxt preview"
   },
   "dependencies": {