concrete/docs/_templates/docs-navbar.html

<div class="container-xl">

    <div id="navbar-start">
      {% for navbar_item in theme_navbar_start %}
      {% include navbar_item %}
      {% endfor %}
    </div>

    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbar-menu" aria-controls="navbar-menu" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>

    {% set navbar_class, navbar_align = navbar_align_class() %}
    <div id="navbar-menu" class="{{ navbar_class }} collapse navbar-collapse">
      <ul id="navbar-main-elements" class="navbar-nav {{ navbar_align }}">
        {%- if show_version %}
        <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            {{ release }}
            </a>
            <div class="dropdown-menu" aria-labelledby="navbarDropdown" id="version-menu"></div>
        </li>
        {% endif %}

        {{ generate_nav_html("navbar", maxdepth=1, collapse=True, includehidden=True, titles_only=True) }}
        {% for external_link in theme_external_links %}
        <li class="nav-item">
            <a class="nav-link nav-external" href="{{ external_link.url }}">{{ external_link.name }}<i class="fas fa-external-link-alt"></i></a>
        </li>
        {% endfor %}
      </ul>

      {% if theme_search_bar_position == 'navbar' %}
        {%- include "search-field.html" %}
      {% endif %}

      {%- block icon_links -%}
      {%- include "icon-links.html" with context -%}
      {%- endblock %}
    </div>
</div>