sol2/sphinx_rtd_theme/breadcrumbs.html

<ul class="wy-breadcrumbs">
  <li><a href="/">Docs</a> &raquo;</li>
  <li><a href="">{{ title }}</a></li>
  {% if display_github %}
    <li class="wy-breadcrumbs-aside">
      <a href="https://github.com/{{ github_user }}/{{ github_repo }}/blob/{{ github_version }}{{ conf_py_path }}{{ pagename }}.rst" class="icon icon-github"> Edit on GitHub</a>
    </li>
  {% endif %}
</ul>
<hr/>