Changes:
-tweaked max-width for @media, some icons need resizing according to
different max-widths
-moved @media css into their single max-width categories
-reorganized folders for examples
-header added
-nav slides right when header bar is toggled
-brand icon now rotates when header bar is toggled

Future:
-combine header and nav into one big nav
-align current navbar to left of nav, so that the navbar stays in view
but the left side of the nav (currently the header) can be hidden or
animated to slide out