Partially revert "Add workflow menu button to thread lists"

This reverts commit 1e10d199a6171f88da129505977bf6ae69c2c362.

Reason for revert: we'll use Lit instead of Vue.js.

The following parts have not been reverted:

- The inject_workflows_menubtn string in the
  src/static/_locales/en/messages.json file, since it will be used again
  in the future, and this might cause the string translations to be
  deleted from Pontoon.
- A minor CSS fix for the padding of .TWPT-btn--with-badge in
  src/static/css/common/console.css.

Bug: twpowertools:115
Change-Id: I099e06d9964b2a5fb4e43baeef1a8fe07fe52043
diff --git a/webpack.config.js b/webpack.config.js
index 9d28abb..bceb4c0 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -2,7 +2,6 @@
 const path = require('path');
 const json5 = require('json5');
 const CopyWebpackPlugin = require('copy-webpack-plugin');
-const {VueLoaderPlugin} = require('vue-loader');
 const WebpackShellPluginNext = require('webpack-shell-plugin-next');
 
 // Pontoon uses their own locale set. This array lets us convert those locales
@@ -115,11 +114,8 @@
           },
         ]
       }),
-      new VueLoaderPlugin(),
       new webpack.DefinePlugin({
         'PRODUCTION': args.mode == 'production',
-        '__VUE_OPTIONS_API__': true,
-        '__VUE_PROD_DEVTOOLS__': args.mode != 'production',
       }),
       ...getCopyPluginsForOverridenLocales(outputPath),
     ],
@@ -139,7 +135,7 @@
         {
           test: /\.s[ac]ss$/i,
           use: [
-            'vue-style-loader',
+            'style-loader',
             'css-loader',
             {
               loader: 'sass-loader',
@@ -151,22 +147,11 @@
           ],
         },
         {
-          test: /\.css$/i,
-          use: [
-            'vue-style-loader',
-            'css-loader',
-          ],
-        },
-        {
           test: /\.js$/i,
           use: [
             preprocessorLoader,
           ],
         },
-        {
-          test: /\.vue$/i,
-          loader: 'vue-loader',
-        },
       ]
     },
   };