Add gtag

Signed-off-by: Jay Wang <[email protected]>

Author: xiaohk

index.html

@@ -62,6 +62,21 @@
       rel="stylesheet"
     />
 
+    <!-- Google tag (gtag.js) -->
+    <script
+      async
+      src="https://www.googletagmanager.com/gtag/js?id=G-MWB75LY452"
+    ></script>
+    <script>
+      window.dataLayer = window.dataLayer || [];
+      function gtag() {
+        dataLayer.push(arguments);
+      }
+      gtag('js', new Date());
+
+      gtag('config', 'G-MWB75LY452');
+    </script>
+
     <link rel="stylesheet" href="/global.css" />
     <script type="module" src="/src/components/page/page.ts"></script>
   </head>