Update default.html

Update Google Analytics to GA4

_layouts/default.html

@@ -80,13 +80,14 @@
     </div>
     <script src="{{ "/assets/js/scale.fix.js" | relative_url }}"></script>
     {% if site.google_analytics %}
+    <!-- Google tag (gtag.js) -->
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-3FKNF0XRRG"></script>
     <script>
-      (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', '{{ site.google_analytics }}', 'auto');
-      ga('send', 'pageview');
+      window.dataLayer = window.dataLayer || [];
+      function gtag(){dataLayer.push(arguments);}
+      gtag('js', new Date());
+
+      gtag('config', 'G-3FKNF0XRRG');
     </script>
     {% endif %}
   </body>