docs(graphs): add graphs link to footer

scipost_django/scipost/templates/scipost/footer.html

@@ -28,6 +28,7 @@
           <li><a href="{% url 'finances:finances' %}" target="_blank">Finances</a></li>
           <li><a href="{% url 'sponsors:sponsors' %}">Sponsors</a></li>
           <li><a href="{% url 'organizations:organizations' %}">Benefitting Organizations</a></li>
+          <li><a href="{% url 'graphs:graphs' %}">Statistics and Graphs</a></li>
         </ul>
       </div>