<div class="unit one-fifth hide-on-mobiles">
  <aside>
    {% for section in site.data.docs_nav -%}
      <h4>{{ section.title }}</h4>
      <ul>
      {%- for item in section.docs -%}
        {%- assign p = site.docs | where: "url", item.link | first %}
        <li {%- if page.url == p.url %} class="current" {%- endif -%}><a href="{{ p.url | relative_url }}">
          {{- p.menu_name | default: p.title -}}
        </a></li>
      {%- endfor %}
      </ul>
    {% endfor -%}
  </aside>
</div>
