{% assign collection = page.collection %} {% assign docs = site. %} {% if docs %}

{% assign sorted_docs = docs | sort:"order","last" %}
<div class="nav-docs">
    <div>
        <h3>{{ collection | upcase }}</h3>
        <ul>
             {% for document in sorted_docs %}
                    <!-- {{ document.date }} -->
                    {% if document.title != null %}
                    <li>
                        {% assign subheadings = document.subheadings %}
                        <a class="active" href="{{ site.baseurl }}{{ document.url }}">{{ document.title }}</a>
                        {% if subheadings.size != 0 %}
                            <ul>
                                {% for subheading in subheadings %}
                                    <li><a href="{{ site.baseurl }}{{ subheading.url }}">{{ subheading.title }}</a></li>
                                {% endfor %}
                            </ul>
                        {% endif %}
                    </li>
                {% endif %}
            {% endfor %}
        </ul>
    </div>
</div>

{% endif %}