Add a bunch of responsive design bullshit.
Fix unstyled post comments/notes.
Remove trailing whitespace.
Add support for "SelectNav.js".

"SelectNav.js" is a JavaScript doohickey that converts lists of links
into drop-down menus, which is useful for creating site navigation for
devices with smaller screens. For more information, See
<https://github.com/lukaszfiszer/selectnav.js>.