Change from prettier-stylelint to stylelint-prettier

[binarykitchen]

prettier-stylelint seems to be unmaintained. No updates for years.

For example this nasty bug https://github.com/prettier/prettier-atom/issues/718 probably won't be ever resolved in prettier-stylelint. But is already solved in stylelint-prettier.

That newer one stylelint-prettier seems very well maintained. Recommend switching to this one instead: https://github.com/prettier/stylelint-prettier