message: remove sandbox link in header
diff: <p align="center">
  <strong>
  - <a href="#options">&nbsp;&nbsp;options&nbsp;&nbsp;</a>
  - <a href="#api">&nbsp;&nbsp;api&nbsp;&nbsp;</a>
  - <a href="#events">&nbsp;&nbsp;events&nbsp;&nbsp;</a>
  - <a href="#codesandbox">&nbsp;&nbsp;codesandbox&nbsp;&nbsp;</a>
  + <a href="#options">options</a>
  + &nbsp; &middot; &nbsp;
  + <a href="#api">api</a>
  + &nbsp; &middot; &nbsp;
  + <a href="#events">events</a>
  + &nbsp; &middot; &nbsp;
  </strong>
  </p>
  