Merge pull request ChartsCSS#29 from ChartsCSS/config

Config: Remove unused plugin

Author: ramiy

src/.vuepress/config.js

@@ -159,7 +159,6 @@ module.exports = {
 
   plugins: [
     '@vuepress/plugin-back-to-top',
-    '@vuepress/plugin-medium-zoom',
     [
       '@vuepress/pwa',
       {