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: [