Revert "ci: Deploy challenge-listing-part-2 to Prod env"

This reverts commit 48bd0b6.

Author: luizrrodrigues

.circleci/config.yml

@@ -75,13 +75,12 @@ workflows:
             branches:
               only:
                 - dev
+                - challenge-listing-part-2
 
       # Production builds are exectuted only on tagged commits to the
       # master branch.
       - "build-prod":
           context: org-global
           filters:
             branches:
-              only:
-                - master
-                - challenge-listing-part-2
+              only: master