Rework the hosts assignment page

Update table design for Deployment Roles according to wireframes (page 26)
Prevent table of hosts to be always visible
Refine "assigning hosts" workflow (page 7-11)
Refine "unassigning hosts" workflow (page 12-16)
Allow user to see deployed hosts for each role (page 26, note #6)
Enable user to close hosts table
It will, but it was already made possible because there were users asking for it. This would introduce regression. Original version was showing red color to warn that deployed host is about to be unassigned. Could you add a better warning?