GitLab

This reverts commit 16748a5f.

From the discussion on the ding mailing list, I said:

I think the colours should be reverted back to what they were before the
change.  Normal text should be white on black (if you have a dark
background), and colours should be used to emphasise or de-emphasise
certain text.  Following that principle, normal Gnus groups should be
white, not ... er...  what are they now?  Teal?