abapGit/docs/_includes/navigation.html

<div class="nav">
  <!-- Navigation -->
  {% for section in site.data.navigation %}
    <div class="nav-section">
      {% if section.file %}
        <a href="{{ section.file }}.html">
      {% endif %}
      <b>{{ section.title }}</b>
      {% if section.file %}
        </a>
      {% endif %}
      <ul>
        {% for item in section.items %}
          <li>
            {% if item.file %}
              <a href="{{ item.file }}.html">
            {% endif %}
            {{ item.title }}
            {% if item.file %}
              </a>
            {% endif %}
            {% if item.subitems %}
              <ul>
                {% for subitem in item.subitems %}
                  <li>
                    <a href="{{ subitem.file }}.html">{{ subitem.title }}</a>
                  </li>
                {% endfor %}
              </ul>
            {% endif %}
          </li>
        {% endfor %}
      </ul>
    </div>
  {% endfor %}
</div>