add Google Tag Manager (#133)

* add Google Tag Manager

* Configure Google Tag Manager in docs.yml (#134)

---------

Co-authored-by: RPC <[email protected]>

Author: bc-devrev

fern/docs.yml

@@ -60,4 +60,8 @@ redirects:
     permanent: true
   - source: /sdks/plug/install-android
     destination: /sdks/mobile/android
-    permanent: true
+    permanent: true
+
+analytics:
+  gtm:
+    container-id: G-XP1LEFVYQ9

fern/fern.config.json

@@ -1,4 +1,4 @@
 {
   "organization": "devrev",
-  "version": "0.46.20"
+  "version": "0.46.22"
 }