Add Google Analytics to index_old.html

index_old.html

@@ -9,6 +9,14 @@
       margin: 0;
     }
   </style>
+  <!-- Google tag (gtag.js) -->
+  <script async src="https://www.googletagmanager.com/gtag/js?id=G-8MSJZ10PZL"></script>
+  <script>
+    window.dataLayer = window.dataLayer || [];
+    function gtag(){dataLayer.push(arguments);}
+    gtag('js', new Date());
+    gtag('config', 'G-8MSJZ10PZL');
+  </script>
   <script>
     window.onload = () => {
       if (document.getElementById('adContainerHeaderDiv').clientHeight === 0) {