refactor: webpack configuration (#398)

* refactor: webpack configuration

* feat: webpack hot reloading

Co-authored-by: Johnny Almonte <johnny243@users.noreply.github.com>

webpack.prod.js

@@ -0,0 +1,6 @@
+const merge = require('webpack-merge');
+const config = require('./webpack.config.js');
+
+module.exports = merge(config, {
+  mode: 'production'
+});