theme: Update google analytics

src/theme/index.hbs

@@ -224,20 +224,13 @@
 
         {{#if google_analytics}}
         <!-- Google Analytics Tag -->
+        <!-- Global site tag (gtag.js) - Google Analytics -->
+        <script async src="https://www.googletagmanager.com/gtag/js?id=UA-109503488-17"></script>
         <script type="text/javascript">
-            var localAddrs = ["localhost", "127.0.0.1", ""];
-
-            // make sure we don't activate google analytics if the developer is
-            // inspecting the book locally...
-            if (localAddrs.indexOf(document.location.hostname) === -1) {
-                (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-                (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-                m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-                })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
-
-                ga('create', '{{google_analytics}}', 'auto');
-                ga('send', 'pageview');
-            }
+         window.dataLayer = window.dataLayer || [];
+         function gtag(){dataLayer.push(arguments);}
+         gtag('js', new Date());
+         gtag('config', '{{google_analytics}}');
         </script>
         {{/if}}