jupyterhub/docs/source/_templates/navigation.html

{# Custom template for navigation.html

   alabaster theme does not provide blocks for titles to
   be overridden so this custom theme handles title and
   toctree for sidebar
#}
<h3>{{ _('Table of Contents') }}</h3>
{{ toctree(includehidden=theme_sidebar_includehidden, collapse=theme_sidebar_collapse) }}
{% if theme_extra_nav_links %}
<hr />
<ul>
    {% for text, uri in theme_extra_nav_links.items() %}
    <li class="toctree-l1"><a href="{{ uri }}">{{ text }}</a></li>
    {% endfor %}
</ul>
{% endif %}