feat: add Google Analytics 4 tracking

Author: skew202

templates/index.html

@@ -5,6 +5,16 @@
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <meta http-equiv="content-type" content="text/html; charset=utf-8">
 
+    <!-- Google tag (gtag.js) -->
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-FHY27GF82H"></script>
+    <script>
+    window.dataLayer = window.dataLayer || [];
+    function gtag(){dataLayer.push(arguments);}
+    gtag('js', new Date());
+
+    gtag('config', 'G-FHY27GF82H');
+    </script>
+
     <!-- Enable responsiveness on mobile devices-->
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     {% if page %}