Bring project up to speed with major code quality and functionality overhauls.

[BUG] Blog post images are not scaling on mobile
[BUG] Gallery keyboard controls not working consistently￼
[BUG] Horizontal site layout is broken
[BUG] Cache customizer CSS [DESIGN] Add consistent edge padding
[DESIGN] Mobile header layout cleanup
[BUG] Code quality is a mess. Cleanup and refactor project.
[DESIGN] Default header layout needs tightened
[DESIGN] Responsive layout for past/future links
[FUNCTION] Add prev/next controls to sidebar widget￼
[FUNCTION] Add bookmarkable slides
[FUNCTION] Progressively load gallery images
[DESIGN] Add Google fonts as default / typography pass￼
[FUNCTION] Unify templates
[BUG] Retina logos are broken
[BUG] Caption widget should only show up when there is a gallery.
[BUG] Edits lag customizer by one