pref:删除编译css插件

sample-form-client-ui/admin/package.json

@@ -46,7 +46,6 @@
     "filemanager-webpack-plugin": "^8.0.0",
     "less": "^4.0.0",
     "less-loader": "^8.0.0",
-    "postcss-cssnext": "^3.1.1",
     "svg-sprite-loader": "^4.1.6",
     "vue-template-compiler": "^2.6.14"
   }

sample-form-client-ui/admin/postcss.config.js

-const cssnext = require("postcss-cssnext");
-module.exports = {
-  plugins: [cssnext],
-};