jekyll/site/_includes/footer.html

<footer>
  <div class="grid">
    <div class="unit one-third center-on-mobiles">
      <p>Written by the <a href="{{ site.repository }}/graphs/contributors">Jekyll&nbsp;Team</a>. Released under the <a href="{{ site.repository }}/blob/master/LICENSE">MIT&nbsp;License</a>.</p>
    </div>
    <div class="unit two-thirds align-right center-on-mobiles">
      <p>
        Proudly hosted by
        <a href="https://github.com">
          <img src="{{ site.url }}/img/footer-logo.png" alt="GitHub • Social coding">
        </a>
      </p>
    </div>
  </div>
</footer>