(DOCSP-32345) Adds Atlas CTA to convert standalone page (#4769)

Author: sarahsimpers

source/tutorial/convert-standalone-to-replica-set.txt

@@ -22,6 +22,13 @@ production, convert the standalone server to a replica set first.
    use, consult the :ref:`security checklist <security-checklist>`
    before you expose your cluster to the internet. 
 
+You can easily migrate from a standalone server
+to a `MongoDB Atlas <https://www.mongodb.com/docs/atlas>`__ cluster.
+MongoDB Atlas is the fully managed service for MongoDB deployments in
+the cloud. To learn more, see `Migrate or Import Data 
+<https://www.mongodb.com/docs/atlas/import/>`__ in the {+atlas+}
+documentation.
+
 Before You Begin
 ----------------