Update pkgdown settings

Author: cicdguy

_pkgdown.yml

@@ -1,9 +1,18 @@
 url: https://insightsengineering.github.io/r.pkg.template
 
 template:
-  params:
-    bootswatch: cerulean
-    ganalytics: UA-125641273-1
+  bootstrap: 5
+  bootswatch: cerulean
+  includes:
+    in_header: |
+       <!-- Global site tag (gtag.js) - Google Analytics -->
+       <script async src="https://www.googletagmanager.com/gtag/js?id=UA-125641273-1"></script>
+       <script>
+         window.dataLayer = window.dataLayer || [];
+         function gtag(){dataLayer.push(arguments);}
+         gtag('js', new Date());
+         gtag('config', 'UA-125641273-1');
+       </script>
 
 navbar:
   right: