Update main.html

docs/theme_custom/main.html

@@ -9,4 +9,5 @@
 {% block footer %}
 <hr>
 <i>Copyright &copy; <a href="https://www.uni.lu/">University of Luxembourg</a> 2018-2021. All rights reserved.</i>
+<script>mermaid.initialize({startOnLoad:true});</script>
 {% endblock %}