Ignore dotfiles from yarn v2

[fifn2]

Yarn version 2 makes some new cache files under .yarn. I don't think they should be commited.

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[rayronvictor]

@fifn2 and what about the zero-installs feature?

[fifn2]

Oh No! I'll add them.

[ianschmitz]

This isn't quite that simple. See https://yarnpkg.com/advanced/qa#which-files-should-be-gitignored.

I'm not sure what we'll want to do here. @arcanis any thoughts on best approach?

[mungojam]

It would be amazing if all CRA dependencies didn't rely on being unplugged as that unplugged folder seems to be one of the more difficult folders to decide to include or not. I think it doesn't work for cross platform teams for example.

[ianschmitz]

Thanks for the PR, but we're not going to make this change at this time. If folks are using yarn 2 in their project they can decide which to ignore depending on their setup.