Update Webpack Dev Server

We should update the configuration as follows (added historyApiFallback option):

// To run development server
devServer: {
  contentBase: __dirname,
  publicPath,
  compress: true,
  port: 9000,
  hot: true,
  index: 'index.html',
  historyApiFallback: {
    index: 'index.html',
  },
},