Add Google Analytics 4 tracking

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Ryan Dolley

index.html

@@ -12,6 +12,15 @@
     <meta name="twitter:card" content="summary_large_image">
     <title>Ryan Dolley — Analytics Industry Advisor & Author</title>
     <link rel="icon" type="image/svg+xml" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>RD</text></svg>">
+    <!-- Google tag (gtag.js) -->
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-72SGSQFECL"></script>
+    <script>
+      window.dataLayer = window.dataLayer || [];
+      function gtag(){dataLayer.push(arguments);}
+      gtag('js', new Date());
+
+      gtag('config', 'G-72SGSQFECL');
+    </script>
     <link rel="stylesheet" href="css/style.css">
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>