news.scss: consolidate .ContentGroupHierarchicalSet
news.scss: consolidate .ContentGroupHierarchicalSet

This module is entirely covered by the default theme.

https://phabricator.endlessm.com/T11949

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib