refact: delete prepush hook

Author: ruanyf

package.json

@@ -6,7 +6,6 @@
     "doc": "docs"
   },
   "scripts": {
-    "prepush": "npm update",
     "build": "loppo --site \"Web API 教程\" --id webapi --theme wangdoc",
     "build-and-commit": "npm run build && npm run commit",
     "commit": "gh-pages --dist dist --dest dist/webapi --branch master --add --repo git@github.com:wangdoc/website.git",