feat: add Google Analytics tracking (G-JY0RQX52GE)

Author: EmanueleMinotto

index.html

@@ -6,6 +6,14 @@
   <title>Skipper — Test control from a Google Spreadsheet</title>
   <meta name="description" content="Enable and disable tests directly from a Google Spreadsheet — no code changes required." />
   <link rel="stylesheet" href="style.css" />
+  <!-- Google tag (gtag.js) -->
+  <script async src="https://www.googletagmanager.com/gtag/js?id=G-JY0RQX52GE"></script>
+  <script>
+    window.dataLayer = window.dataLayer || [];
+    function gtag(){dataLayer.push(arguments);}
+    gtag('js', new Date());
+    gtag('config', 'G-JY0RQX52GE');
+  </script>
   <script>
     (function () {
       var stored = localStorage.getItem('skipper-theme');