build: Remove obsolete csscomb rules
build: Remove obsolete csscomb rules

Removing obsolete csscomb rules as stylelint has taken its place.

Change-Id: Icf476b1bcaf3ed227cffcfc07874494009c38d08

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui