{# display title for parent 'category' linked to URL of first 'child' page #}

<nav class="nav-main collapsed" aria-label="Main menu" role="navigation">
  {% set navlevel = 1 %}
  {% for nav_item in nav %}
    {% if nav_item.is_section %}
      <p class="caption"><span class="caption-text">{{ nav_item.title }}</span></p>
      <ul{% if nav_item.active %} class="current"{% endif %}>
        {% for nav_item in nav_item.children %}
          <li class="toctree-l{{ navlevel }}{% if nav_item.active %} current{% endif %}">
            {% include 'nav.html' %}
          </li>
        {% endfor %}
      </ul>
    {% elif config.theme.include_homepage_in_sidebar or (not nav_item == nav.homepage) %}
      <ul{% if nav_item.active %} class="current"{% endif %}>
        <li class="toctree-l{{ navlevel }}{% if nav_item.active %} current{% endif %}">
          {% include 'nav.html' %}
        </li>
      </ul>
    {% endif %}
  {% endfor %}
</nav>