OverviewPage/_includes/navigation.html

<div class="col-3 col-s-3 menu">
	<ul>
		{% for item in site.data.navigation %}
		<a href="{{ item.link }}">
			<li {% if page.url == item.link %}class="current"{% endif %}>{{ item.name }}</li>
		</a>
		{% endfor %}
	</ul>
</div>