FIXED: Ensure all theme colors have visible text

(Windows 10/Chrome). Enabled Superhero(?) theme and in the Manage Dens section it has white text on white background making the text unreadable. See highlighted text as an example.

This is fixed up. Thanks for the feedback!

Incidentally the “Slate” theme is not going to make the cut and will not be available soon.

Yes - I think limiting the # of themes to a few that work well is fine.

Sketchy is my favorite theme. I like silly.