doc/_templates/breadcrumbs.html

{% extends "!breadcrumbs.html" %}
{% block breadcrumbs %}
  <!-- {{ docs_title }} -->
  {# parameterize default name "Docs" in breadcrumb via docs_title in conf.py #}
  {% if not docs_title %}
  {% set docs_title = "Docs" %}
  {% endif %}

  <li><a href="{{ pathto(master_doc) }}">{{ docs_title }}</a> &raquo;</li>
  {% for doc in parents %}
     <li><a href="{{ doc.link|e }}">{{ doc.title }}</a> &raquo;</li>
  {% endfor %}
  <li>{{ title }}</li>
{% endblock %}