Add public path in webpack config

frontend/webpack.config.js

@@ -5,7 +5,8 @@ module.exports = {
   entry: './assets/scripts/index.js',
   output: {
     filename: 'main.js',
-    path: path.resolve(__dirname, 'build/')
+    path: path.resolve(__dirname, 'build/'),
+      publicPath: '/assets/',
   },
   module: {
     rules: [