remove temporary cli test plugin

Author: shigma

packages/docs/docs/.vuepress/config.js

@@ -84,7 +84,6 @@ module.exports = ctx => ({
       before: info => `<UpgradePath title="${info}">`,
       after: '</UpgradePath>',
     }],
-    [require('./plugins/vuepress-plugin-extend-cli-test'), true]
   ],
 })