docs/theme/mkdocs/breadcrumbs.html

<ol class="breadcrumb">
  <li><a href="{{ homepage_url }}"><span class="glyphicon glyphicon-home"></span></a></li>
  {% for section in nav %}
    {% if section.active %}
      <li><a href="../">{{ section.title }}</a></li>
      {% if section.children %}
        <li class="active"><a href="{{ current_page.url }}">{{ current_page.title }}</a></li>
      {% endif %}
    {% endif %}
  {% endfor %}
  <li class="pull-right edit-on-github"><a href="https://github.com/dotcloud/docker/blob/master/docs/sources/{{ current_page.input_path }}"><span class="glyphicon glyphicon-edit"></span>Edit on GitHub</a></li>
</ol>