Added pages, changed grid, cleaned up code

-put (most) of css into VisualizerStyle.css
- put (most) of javascript in Visualizer.js

- added home.html, WarmupChoose.html, LearnChoose.html, and
notimplemented.html (redirects pages that weren’t implemented)

- added a PDF viewer to choose pages (need to have it change on the on
click)

Grid - taking Ben’s advice I decided to get rid of slickgrid. It was
way more functionality than we needed and made our code really messy.
Put in a table instead with radio buttons and check boxes.

(my) next step: work on the multilayered canvas to “draw” over the
spectrograph.

***Also put all old files in the “Old Stuff” folder, so if I deleted
something, its in there
delted