Brackets and Dark Mode

[curran]

Feedback from someone who used VZCode in VizHub to give a live coding workshop:

went well! people loved it. some fun technical issues not only to do with Vizhub. the room was so bright i had to switch to light mode. but that made the brackets disappear too? anyway such a minor thing.

I think this may be to do with the rainbow brackets.

I feel like @michaelhelper you may have mentioned this earlier but I don't recall.

The first thing to do is to test the light mode / dark mode, then see if we can get the syntax highlighting to work well in both modes, including rainbow brackets.

One potential short term "fix" would be to disable rainbow brackets until we can get this resolved. Could do by putting the entire rainbow brackets feature behind a feature flag.

[curran]

TODO drop screenshots of light mode vs. dark mode