Amend breadcrumbs to link to the section indexes, i.e., home/section/

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)

docs/theme/mkdocs/breadcrumbs.html

@@ -2,13 +2,9 @@
   <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 %}
-        {% for page in section.children[:1] %}
-        <li><a href="{{ page.url }}">{{ section.title }}</a></li>
-        {% endfor %}
-      {% endif %}
-      {% if section.children %}
-      <li class="active"><a href="{{ current_page.url }}">{{ current_page.title }}</a></li>
+        <li class="active"><a href="{{ current_page.url }}">{{ current_page.title }}</a></li>
       {% endif %}
     {% endif %}
   {% endfor %}