replace lint-staged + prettier with pretty-quick + husky; readd eslint

- lint-staged and prettier do not handle partially staged files properly
  (see lint-staged/lint-staged#62)
  instead, the whole file gets readded through git add in the hook
  this is surprising and unexpected behaviour
  pretty-quick --staged should not re-stage partially staged files
  and should exit with a non-zero errorcode to let the user know.
- eslint does more than just formatting and can be used together with
  prettier