Added the ability to use google analytics using Hugo's internal template. Added a sample config and instructions to config.yaml for the example site and added in a link for the google analytics internal template for the navbar partial per https://gohugo.io/templates/internal/

layouts/partials/navbar.html

@@ -1,3 +1,4 @@
+{{ template "_internal/google_analytics_async.html" . }}
 {{- $navbar         := .Site.Params.navbar }}
 {{- $sidebarVisible := .Site.Params.sidebar }}
 {{ if .Params.sidebar }}