card prioritization https://gitlab.com/leanlabsio/kanban/issues/119
- using labels, e.g.
KB[priority][2][my name for high priority]
- priority label colors are applied to card background with 20% opaque (i.e. 80% transparent)
- priority name is included as html tag
title
and displayed as tooltip when mousehovered - no labels creation from Kanban yet (like we do with stages), users have to do it manually inside gitlab
- no vertical move to change priority yet (like we do with stages)
- no test cover