Dark Mode

[omrzgit]

Not an issue, just suggesting, button that make the site dark.. and stays that way based on cookie

[captbaritone]

Colors are based on Solarized which has a dark mode, so this should be pretty possible. Rather than basing it on cookies though, I think it could just rely on prefers-color-scheme. I probably won't have time to add this myself, but it seems like a reasonable idea so I'll leave the issue open in case someone else wants to open a PR.