DOP-1985: add tck=docs_landing to uni & comm links

Author: schmalliso

source/index.txt

@@ -68,7 +68,7 @@ Welcome to the MongoDB Documentation
    .. card::
       :headline: Build a serverless application
       :cta: Get started with MongoDB Realm
-      :url: https://docs.mongodb.com/realm
+      :url: https://docs.mongodb.com/realm/
       :icon: /images/icons/realm.svg
       :icon-alt: MongoDB Realm icon
 
@@ -107,7 +107,7 @@ Community.
    .. card::
       :headline: Free Online Courses on MongoDB University
       :cta: Get started on MongoDB University
-      :url: http://university.mongodb.com/
+      :url: http://university.mongodb.com/?tck=docs_landing
       :tag: University
 
       Build your MongoDB expertise for free with in-depth lessons and
@@ -116,7 +116,7 @@ Community.
    .. card::
       :headline: Collaborative Community Forums
       :cta: Join our Community
-      :url: https://community.mongodb.com/
+      :url: https://community.mongodb.com/?tck=docs_landing
       :tag: Community
 
       Learn and build relationships with like-minded developers using