docs/includes/sidebar-guides.html

<ul class="sidebar-categories">
  {% for category in product[1].categories %}
  <li class="sidebar-category {% if breadcrumbs.category.href == category[1].href %}active{% endif %}">
    <a href="{{category[1].href}}">{{ category[1].title }}</a>
    <!-- some categories have topics with child articles -->
    {% if category[1].maptopics %}
    <ul class="sidebar-maptopics">
      {% for maptopic in category[1].maptopics %}
      <li class="sidebar-maptopic {% if breadcrumbs.maptopic.href == maptopic[1].href %}active{% endif %}">
        <a href="{{maptopic[1].href}}">{{ maptopic[1].title }}</a>
        <ul class="sidebar-articles">
          {% for article in maptopic[1].articles %}
          <li class="sidebar-article {% if currentPath == article[1].href %}active{% endif %}">
            <a href="{{article[1].href}}">{{ article[1].title }}</a>
          </li>
          {% endfor %}
        </ul>
      </li>
      {% endfor %}
    </ul>
    <!-- some categories have no maptopics, only articles -->
    {% else %}
    <ul class="sidebar-articles">
      {% for article in category[1].articles %}
      <li class="sidebar-article{% if currentPath == article[1].href %} active{% endif %}">
        <a href="{{article[1].href}}">{{ article[1].title }}</a>
      </li>
      {% endfor %}
    </ul>
    {% endif %}
  </li>
  {% endfor %}
</ul>