Check if we can use husky v6 to run prettier automatically

[blumamir]

Currently, we need to manually lint / prettier before pushing to github. This is done by running yarn prettier.
The job can be done automatically by husky git hook, but it was removed from the repo due to a bug in husky with monorepos: typicode/husky#677

I now read in the issue that it might be fixed in husky v6.
This issue is to test and add the husky hook if it now works correctly.