v3.0.0

#Major Changes
Removed Prettier and Prettier Eslint config. Eslint rules are now mostly for likely coding errors, and mostly no longer dictate styles. A couple style rules are still applied (single quote strings, require semi-colons), but often with warnings rather than errors.

Added postcss-loader and Autoprefixer. These should probably have been in since the start, but they're here now! (Unfortunately, it's not properly configured yet.)

Added WebpackCopyPlugin to handle static assets from /public besides just index.html (which has separate handling). Any other files added will be copied to /build on build (and to the in-memory webpack-dev-server resources for development).

#Minor Change
The webpack config for styles has been rewritten to make it easier to modify (such as for adding css-module support).

#But...
Don't use this version yet. The next patch will correctly setup browserlist for Autoprefixer!