Remove references to moment.js from webpack

This removes the reference to moment.js from our webpack config.
chart.js was the last dependency depending on it.

mermaid now utilizes moment-mini, so we are putting that into the vendor
DLL instead.

pikaday also removed it's dependency in 1.8.0:
https://github.com/Pikaday/Pikaday/releases/tag/1.8.0

config/webpack.config.js

@@ -329,9 +329,6 @@ module.exports = {
     // automatically configure monaco editor web workers
     new MonacoWebpackPlugin(),
 
-    // prevent pikaday from including moment.js
-    new webpack.IgnorePlugin(/moment/, /pikaday/),
-
     // fix legacy jQuery plugins which depend on globals
     new webpack.ProvidePlugin({
       $: 'jquery',

config/webpack.vendor.config.js

@@ -38,7 +38,7 @@ module.exports = {
       'katex',
       'three',
       'select2',
-      'moment',
+      'moment-mini',
       'aws-sdk',
       'sanitize-html',
       'bootstrap/dist/js/bootstrap.js',