Completely rewrote interface.

Interface uses Bootstrap and better responsive design; new fonts and
colors; better organization; brand-new navigation framework; smoother,
snappier interface. Also includes card printing and local backup.
Improved studying interface.
Added toasts and improved interface.
Refined interface and added slide-out menu.
Removed unnecessary holdover code and polished.
Version 1.0.0.
Removed PHP for privacy reasons.
Merge branch 'Platinum'

Moving new code to master.