Digikam Website Table Readability

[Simon Frei]

Hi Mica and Pat

I just stumbled over this report
(https://bugs.kde.org/show_bug.cgi?id=401100) that the contrast on the
release plan table is not very readable
(https://www.digikam.org/documentation/releaseplan/). Looking at the
source it is a default markup table, not some legacy html. So I guess
that's something that could be improved in the overall css-theme. I'd be
nice if you could have a look at some point.

Cheers
Simon