<ul class="list-inline">
  <li>
    <a href="https://github.com/exercism/exercism.io">
      <i class="fa fa-github fa-lg"></i>
      GitHub
    </a>
  </li>
  <li>
    <a href="https://tinyletter.com/exercism">
      <i class="fa fa-envelope"></i>
      Newsletter
    </a>
  </li>
</ul>

<ul class="list-inline">
  <li>
    <a href="https://github.com/exercism/exercism.io">
      <i class="fa fa-github fa-lg"></i>
      GitHub
    </a>
  </li>
  <li>
    <a href="https://twitter.com/exercism_io">
      <i class="fa fa-twitter fa-lg"></i>
      Twitter
    </a>
  </li>
  <li>
    <a href="https://tinyletter.com/exercism">
      <i class="fa fa-envelope"></i>
      Newsletter
    </a>
  </li>
</ul>

Add Twitter link to footer
Add Twitter link to footer
