Customize font and colors

[MikeShi42]

Some users have a preference for different fonts (monospace vs sans serif) and colors as well. We should allow users to customize their display - likely similar to an editor.

Example feedback from HN: https://news.ycombinator.com/item?id=37562134

Implementation details are likely to be similar to #29

Opening this to feedback as well in terms of what kinds of font/color/customizations people would be looking for :)

[nanocat-net]

I'd like this very much. I like a monospaced font for the log display, but I'd love the be able to pick something more comfortable for the UI itself!