Added Google Analytics 4 to the documentation page(s).
<link rel="stylesheet" href="cometd.css">
<link rel="stylesheet" href="toc.css">
<script src="toc.js"></script>
+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-11897685-2"></script>
+<script>
+ window.dataLayer = window.dataLayer || [];
+ function gtag(){dataLayer.push(arguments);}
+ gtag('js', new Date());
+ gtag('config', 'UA-11897685-2');
+</script>
