Revert "OSDOCS3127: Add overview page for migration toolkit for containers"

Author: bergerhoffer

_topic_maps/_topic_map.yml

@@ -2181,8 +2181,6 @@ Name: Migration Toolkit for Containers
 Dir: migration_toolkit_for_containers
 Distros: openshift-enterprise,openshift-origin
 Topics:
-- Name: Migration toolkit for containers overview
-  File: index
 - Name: About MTC
   File: about-mtc
 - Name: MTC release notes