Merge pull request appwrite#107 from umami-software/gtm-tracker-update

add GTM snippet on tracker config page

Author: mikecao

content/tracker-configuration.mdx

@@ -72,3 +72,19 @@ Usage:
   data-domains="mywebsite.com,mywebsite2.com"
 ></script>
 ```
+
+### Google Tag Manager
+
+Google Tag Manager will strip the attributes from the tracker, so you can bypass this by using the format below.
+
+Usage:
+```
+<script>
+  (function() {
+    var el = document.createElement("script");
+    el.setAttribute("src", "http://mywebsite.com/umami.js");
+    el.setAttribute("data-website-id", "94db1cb1-74f4-4a40-ad6c-962362670409");
+    document.body.appendChild(el);
+  })();
+</script>
+```