[Improvement] Dark Theme

[2E0PGS]

Improvement idea: Add a dark theme so late night programmers / lurkers don't burn their retinas.

I think bootstrap has possibility for simple toggle switch CSS swap between dark and light themes.

Quite a few sites are adopting this now. Even MSDN (Microsoft Developer Network).

[madnight]

Nice improvement idea. If it's simple to add i'll do so (in githut2 https://github.com/madnight/githut)