Default UI color scheme is pink

[chipsenkbeil]

As referenced in #114 (comment), the default color scheme for :Distant UI appears to be pink and hard to read. I thought I would have a good experience copying the colors from mason.nvim, but I may have chosen bad highlight groups that aren't using the explicit colors. Will need to check and see.

To test this, I can run neovim with ONLY the distant.nvim plugin in the runtime path. Opening :Distant will result in the pink window like below:

[chipsenkbeil]

Lazy.nvim situation

It is also pink if we just load it.

[chipsenkbeil]

Mason.nvim situation

It is also pink if we just load it.

[chipsenkbeil]

Because both mason and lazy have the same issue, I'm going to move this out of being a blocker for 0.3.0. In fact, I'm going to move it to the backlog as it isn't something worth tackling for 0.3.x for me right now.