title: Is there a way to have `react-scripts` include extra files in the root of the build?
body: <p><strong>My Situation:</strong></p>
  
  <p>I'm hosting an app created with <code>create-react-app</code> on Surge. In order to have Surge let <code>react-router</code> handle the routes, I have to add a 200.html to the root, and in order to handle 404s, I have to add a 404.html to the root. The problem is, with <code>npm run build</code>, only <code>index.html</code> and <code>favicon.ico</code> are added to the root of the build directory.</p>
  
  <p><strong>Possible Solution:</strong></p>
  
  <p>I can copy other files by making the <code>build</code> script in package.json <code>react-scripts build &amp;&amp; cp 200.html 404.html build</code>.</p>
  
  <p><strong>Question:</strong></p>
  
  <p>Is there a better way to have <code>react-scripts</code> add extra files to the root of the build, rather than relying on bash scripting in package.json?</p>