Site is not "mobile friendly"

[fyodr]

The site as a whole does not scale well to mobile device screen sizes. Besides #26 , our overspecification of pixels and certain css choices are somewhat uncooperative with the small-screen-high-resolution combo.

In the 21st century, this should be a high priority.

[bmccutchon]

We need responsive design (potentially via a library like Bootstrap), and, as part of that, we need to use the viewport meta tag to tell browsers that our site is mobile-friendly.