Added tracking on the docs website. (#1801)

Author: StevenAltimate

documentation/docs/overrides/main.html

@@ -0,0 +1,9 @@
+{% extends "base.html" %}
+
+{% block extrahead %}
+  <!-- Start of Reo Javascript -->
+  <script type="text/javascript">
+    !function(){var e,t,n;e="e4fe6006f75148d",t=function(){Reo.init({clientID:"e4fe6006f75148d"})},(n=document.createElement("script")).src="https://static.reo.dev/"+e+"/reo.js",n.defer=!0,n.onload=t,document.head.appendChild(n)}();
+  </script>
+  <!-- End of Reo Javascript -->
+{% endblock %}