On: Revert the GitHub dark header

[djh_]

I really dislike the dark header - it draws attention away from the content and towards the nav because the contrast is so great.

[wybiral → djh_]

I remember when Google search stopped using underlines on their search result links... I couldn't stand it. Now I'd probably have the same reaction if they switched back.

[colept → djh_]

They should make the rest of the site dark to match. Problem solved.