This update uses a function to apply the z-index in each .scss file.
The function needs to iterate over a map of z-index values, so all of
the z-indexes end up in a single list and can be tracked more easily.
This allows us to manage all z-index values in a single location.
Rather than using relative paths for css imports - which can break when
we move files around - add our styles path to the webpack sass-loader
loader using the `includePaths` setting.
React v16.x reports errors when using boolean operators for conditional
classnames and requires that you instead use ternary style conditional
clauses.
The final size of renderer.prod.js is about 4.75mb. 2.35mb of this comes
from react-icons.
Update the react icon imports to import only the specific icons that we
use. This reduces the final size of renderer.prod.js by about 50%
dfat
Tom Kirkpatrick
Evan Kaloudis
Jack Mallers
pajasevi