moby/docs/theme/mkdocs/toc.html

{% for toc_item in toc %}
  {% for toc_h2_item in toc_item.children %}
    <li class=""><a href="{{ toc_h2_item.url }}">{{ toc_h2_item.title }}</a></li>
    {% for toc_h3_item in toc_h2_item.children %}
      <h3><a href="{{ toc_h3_item.url }}">{{ toc_h3_item.title }}</a></h3>
    {% endfor %}
  {% endfor %}
{% endfor %}