chore: update idoc config.

Author: jaywcjlove

idoc.yml

@@ -26,4 +26,11 @@ sideEffectFiles:
 
 footer: |
   This work is licensed under a <a href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 International License</a>.<br>
-  Generated by <a href="https://github.com/jaywcjlove/idoc" target="_blank">idoc</a> v{{idocVersion}}
+  Generated by <a href="https://github.com/jaywcjlove/idoc" target="_blank">idoc</a> v{{idocVersion}}
+  <script async src="https://www.googletagmanager.com/gtag/js?id=G-SFKVKE1QRF"></script>
+  <script>
+    window.dataLayer = window.dataLayer || [];
+    function gtag(){dataLayer.push(arguments);}
+    gtag('js', new Date());
+    gtag('config', 'G-SFKVKE1QRF');
+  </script>