{% assign logo_path = site.main_logo %} <header class=“style-default”>

  <div class="container text-center">
          <div class="row">
                  <div class="col">
                          <a class="main-logo mt-5" href="{{ '/' | relative_url }}"><img src="{{ logo_path | relative_url }}" alt=" "></a>
                  </div>
          </div>
          <div class="row">
                  <div class="col">
                          <h1 class="mt-3 mb-0">{{ site.name }} some</h1>
                          <p class="text-info text-lg">{{ site.description }}</p>
                  </div>
          </div>
          <ul class="nav d-flex justify-content-center mb-5">
                  {%- for link in site.data.navigation.main -%}
                          {%- if link.url contains '://' -%}
                                  {%- assign url = link.url -%}
                          {%- else -%}
                                  {%- assign url = link.url | relative_url -%}
                          {%- endif -%}
                          <!-- {{ page.url }} -->
                          <li class="nav-item">
                                  <a class="nav-link {% if page.url==url %}active{% endif %}" href="{{ url }}">{{ link.title }}</a>
                          </li>
{%- endfor -%}
<!-- show collection navigation -->
{% for collection in site.collections %}
  {% if collection.navigation %}
    <li class="nav-item">
      <a class="nav-link {% if page.url==url %}active{% endif %}" href="/{{ collection.relative_directory | remove_first: '_' }}">{{ collection.label | capitalize }}</a>
    </li>
    <!-- create categories array-->
    {% assign categories_col = "" | split:"|" %}
    <!--Add each unique 'my_collection' category to the array-->
    {% for post in collection.docs %}
      {% for category in post.categories %}
        {% assign categories_col = categories_col | push: category | uniq %}
      {% endfor %}
    {% endfor %}
    <!-- show category navigation -->
    {% for cat in categories_col %}
      <li class="nav-item">
        <a class="nav-link {% if page.url==url %}active{% endif %}" href="/{{ collection.relative_directory | remove_first: '_' }}/{{ cat }}">{{ cat | capitalize }}</a>
      </li>
    {% endfor %}
  {% endif %}
{% endfor %}
          </ul>
  </div>

</header>