Show mobile users some love

Because some sad soul looking at my profile in the Twitter app is
going to tap the link to my website, and I don't want to let them
down.

On mobile...
* Make the navbar mobile friendly
        * Don't hide the whole thing like an asshole would
        * Only show internal links (external links will get put in a
          footer later on)
        * Center it and make it pretty
* Hide that giant photo of me on the index
* Make the header hipstery (use that photo of me as a background)