feat: add override

docs/_overrides/main.html

@@ -47,3 +47,10 @@
   <!-- Extra JavaScript (can't be set in mkdocs.yml due to content hash) -->
   <script src="{{ 'overrides/assets/javascripts/bundle.js' | url }}"></script>
 {% endblock %}
+
+{% block outdated %}
+  You're not viewing the latest version.
+  <a href="{{ '../' ~ base_url }}">
+    <strong>Click here to go to latest.</strong>
+  </a>
+{% endblock %}