Migrate assets to use Webpacker

config/webpack/loaders/erb.js

@@ -0,0 +1,11 @@
+module.exports = {
+  test: /\.erb$/,
+  enforce: 'pre',
+  exclude: /node_modules/,
+  use: [{
+    loader: 'rails-erb-loader',
+    options: {
+      runner: (/^win/.test(process.platform) ? 'ruby ' : '') + 'bin/rails runner'
+    }
+  }]
+}