Merge feature/ga4-cross-domain-tracking

about.html

@@ -9,6 +9,8 @@
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link href="https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;600;700&family=Nunito+Sans:wght@400;500;600&display=swap" rel="stylesheet">
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-Z15EG3SFPD"></script>
+    <script src="js/analytics.js"></script>
 </head>
 <body>
     <header class="site-header">

contact.html

@@ -9,6 +9,8 @@
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link href="https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;600;700&family=Nunito+Sans:wght@400;500;600&display=swap" rel="stylesheet">
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-Z15EG3SFPD"></script>
+    <script src="js/analytics.js"></script>
 </head>
 <body>
     <header class="site-header">

index.html

@@ -9,6 +9,8 @@
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link href="https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;600;700&family=Nunito+Sans:wght@400;500;600&display=swap" rel="stylesheet">
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-Z15EG3SFPD"></script>
+    <script src="js/analytics.js"></script>
 </head>
 <body>
     <header class="site-header">

js/analytics.js

@@ -0,0 +1,9 @@
+// SloanOps GA4 tracking for the Happy Tails demonstration site.
+window.dataLayer = window.dataLayer || [];
+function gtag(){window.dataLayer.push(arguments);}
+gtag('js', new Date());
+gtag('config', 'G-Z15EG3SFPD', {
+    linker: {
+        domains: ['sloanops.com', 'wordpress.sloanops.com', 'product-example.sloanops.com', '3031023.xyz', 'test-company.sloanops.com']
+    }
+});

services.html

@@ -9,6 +9,8 @@
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link href="https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;600;700&family=Nunito+Sans:wght@400;500;600&display=swap" rel="stylesheet">
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-Z15EG3SFPD"></script>
+    <script src="js/analytics.js"></script>
 </head>
 <body>
     <header class="site-header">