Add Google Analytics tag (#153)

Author: rbessems

tutorial/tutorial_sphinx_theme_1/layout.html

@@ -631,7 +631,12 @@
     {%- if theme_analytics_id %}
     <!-- Theme Analytics -->
     <script async src="https://www.googletagmanager.com/gtag/js?id={{ theme_analytics_id }}"></script>
-    <script></script>
+    <script>
+  		window.dataLayer = window.dataLayer || [];
+  		function gtag(){dataLayer.push(arguments);}
+  		gtag('js', new Date());
+  		gtag('config', '{{ theme_analytics_id }}');
+	</script>
 
     {%- endif %}
   {%- endif %}

tutorial/tutorial_sphinx_theme_1/theme.conf

@@ -5,7 +5,7 @@ pygments_style = default
 
 [options]
 canonical_url =
-analytics_id =
+analytics_id = G-HLDXVJYYPC
 analytics_anonymize_ip = False
 collapse_navigation = True
 sticky_navigation = True