<div class="docs-nav-mobile unit whole show-on-mobiles">
  <select onchange="if (this.value) window.location.href=this.value">
    <option value="">Navigate the tutorials…</option>
    {% for section in site.data.tutorials %}
    <optgroup label="{{ section.title }}">
      {% include tutorials_option.html items=section.tutorials %}
    </optgroup>
    {% endfor %}
  </select>
</div>