Prettier for Stylelint, ESLint

[evanmwillhite]

Research using https://prettier.io/ for autoformatting code not in place of, but alongside ESLint and Stylelint.

Would like to configure both linters to ignore things Prettier will automatically fix.

Marking as postponed until we get ESLint in.

Stylelint article: https://css-tricks.com/prettier-stylelint-writing-clean-css-keeping-clean-code-two-tool-game/