title: Vue Cli 3 build custom directory for different type of files
body: <p>I am new in using vue to build web app.
  By default, use <code>npm run build</code>, it will build the following structure:</p>
  
  <p><a href="https://i.stack.imgur.com/RWp4H.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RWp4H.png" alt="enter image description here"></a></p>
  
  <p>But I hope to build as follow:</p>
  
  <p><a href="https://i.stack.imgur.com/79SaX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/79SaX.png" alt="enter image description here"></a></p>
  
  <p>Then, how can I write the <code>vue.config.js</code> as output like what I want?</p>