CI passes even if formating is bad

[aaryansinhaa]

We currently use prettier . --write, it should be yarn format-check and yarn lint-check command for use in the CI so that it fails the CI if it contains bad things.

As discussed in #145

[aaryansinhaa]

@benoit74 I've opened related issues, I think I have checked on almost all openzim repo, but please verify, thanks. also please assign me these issues, happy to help!