fix(UIUX): add links to logos in footer

discuss_data/templates/footer.html

@@ -5,10 +5,10 @@
             <div class="col-md-1"></div>
             <div class="col-md-4">
                 {# <img class="footer-logo" src="{% static 'images/logo-primary.svg' %}" />  #}
-                <img class="footer-logo-fso" src="{% static 'images/fso-logo.png' %}" />
+                <a href="https://www.forschungsstelle.uni-bremen.de/en/" target="_blank"><img class="footer-logo-fso" src="{% static 'images/fso-logo.png' %}" /></a>
             </div>
             <div class="col-md-2 text-center">
-                <img class="footer-logo-sub" src="{% static 'images/sub-logo.png' %}" />
+                <a href="https://www.sub.uni-goettingen.de/" target="_blank"><img class="footer-logo-sub" src="{% static 'images/sub-logo.png' %}" /></a>
             </div>
             {% comment %}
             <div class="col-md-3">
@@ -16,7 +16,7 @@
             </div>
             {% endcomment %}
             <div class="col-md-2">
-                <img class="footer-logo-dfg" height="100" src="{% static 'images/dfg-logo.svg' %}" />
+                <a href="https://www.dfg.de" target="_blank"><img class="footer-logo-dfg" height="100" src="{% static 'images/dfg-logo.svg' %}" /></a>
             </div>
             <div class="col-md-3">
                 <nav class="float-right">