Theming: Support custom theming

[zachlloyd]

There are several potential parts to this:

1. A richer set of built in themes (right now we just support light and dark mode).
2. A way of building and sharing custom themes.

Please upvote if this is something you're interested in!

[patspam]

Want to make sure https://github.com/chriskempson/base16 is on your radar.

I found when using iTerm that the best approach for consistently getting the colours I wanted across all my CLI programs (Vim, powerline, tmux, etc) was to use ANSI colours in iTerm, and then plugins like https://github.com/chriskempson/base16-vim.

Update: I had to disable chriskempson/base16-vim because it was making my Warp+Vim experience incredibly slow.

[alokedesai]

We now support fully custom themes via a file in our newest release launched today. Please check out https://github.com/warpdotdev/themes for more information on how to define your own custom theme!

[patspam]

Love how quickly you added this!