Sass reformat merged master

[ryanhugh]

TODO: not done yet

• Moved the css files to a css folder
• Removed css modules from package.json and the webpack config

TODO:

• [ ] Actually convert a lot of the css to scss

In the jest snapshot changes this is pretty common. Not really sure what is going on, but am ok with just approving them.

-          "key": ".1",
+          "key": undefined,

[edward-shen]

Close #49 in favor of this one?

[ryanhugh]

@edward-shen Totally forgot about the other one lol - I'll close this one and we can keep the other one