community.general/docsite/_themes/bootstrap/relations.html

{%- if prev %}
  <li><a href="{{ prev.link|e }}"
         title="{{ _('previous chapter') }}">{{ "&laquo;"|safe }} {{ prev.title }}</a></li>
{%- endif %}
{%- if next %}
  <li><a href="{{ next.link|e }}"
         title="{{ _('next chapter') }}">{{ next.title }} {{ "&raquo;"|safe }}</a></li>
{%- endif %}