<nav class=“nav”>

<ul class="list list--nav">
  {% for item in site.html_pages %}
    {% unless item.title == false or item.url contains "/page" or item.url contains "/404.html" %}
      <li class="item  item--nav{% if item.url == page.url %}  item--current{% endif %}">

        {% if item.url contains '://' %}
          {% assign url = item.url %}
        {% else %}
          {% assign url = item.url | relative_url %}
        {% endif %}

        {% if item.collectionpage %}
          {% assign collectiondata = site.collections | where: "label", item.collectionpage | first %}
          <a href="{{ url }}">{{ collectiondata.title }}</a>
        {% else %}
          <a href="{{ url }}">{{ item.title }}</a>
        {% endif %}
      </li>
    {% endunless %}
  {% endfor %}
</ul>

</nav>