Top nav squished

[yutotakano]

Hi! Just reporting that the top nav appears quite squished for me on docs.monogame.net.

The width limitation (not using the full width) appears to be so that it looks consistent with the homepage monogame.net, but the addition of a search bar in the docs uses up more space.

I can't think of a good solution that both respects the width constraint of the homepage topnav and the presence of a search bar, but if someone has any ideas, I can try to PR a fix!