Address the deprecation notice enforced in Hugo v0.133.1 (#429)

layouts/partials/head_includes.html

@@ -3,7 +3,7 @@
   to be used together. There may be situations where a organization support both tag methods simultaneously.
 ------------->
 <!-- Check for the Global GoogleAnalytics variable to use the Hugo internal google_analytics template -->
-{{ if .Site.GoogleAnalytics }} {{ template "_internal/google_analytics.html" . }} {{ end }}
+{{ if .Site.Config.Services.GoogleAnalytics.ID }} {{ template "_internal/google_analytics.html" . }} {{ end }}
 <!-- Check for googleAnalytics_UA param to use the google-analytics-ua partial -->
 {{ if .Site.Params.googleAnalytics_UA }} {{ partial "google-analytics-ua.html" . }} {{ end }}
 
@@ -65,4 +65,4 @@
     {{- else -}}
         <link rel="alternate" type="application/rss+xml" title="{{$.Site.Title}}" href="{{"episode/index.xml" | absURL }}"/>
     {{- end -}}
-{{ end }}
+{{ end }}