footer.html

{% if site.baseurl != '/' %}
{% assign base_url = site.baseurl | append: '/' %}
{% else %}
{% assign base_url = site.baseurl %}
{% endif %}
<footer class="footer">

    {% include transition.html direction="top" %}

    <div id="footer-content-container">

        <a href="https://www.helmholtz.de/" class="logo-link">
            <img    class="logo"
                    src="{{ '/assets/img/Helmholtz_Logo.svg' | relative_url }}"
                    alt="Helmholtz Logo">
        </a>

        <nav>
            <a href="{{ site.gitlab.project_url }}/blob/master/CONTRIBUTING.md" class="btn btn-primary">
                Contribute&nbsp;on&nbsp;
                <i class="fab fa-gitlab" aria-hidden="true"></i>
            </a>

            {% for entry in site.data.navigation.footer %}
                <a href="{{ base_url }}{{ entry.url }}" class="btn btn-primary">
                    {{ entry.title }}
                </a>
            {% endfor %}
        </nav>
     </div>
 </footer>