Potentially confusing usage of Yarn modern/berry in branding

[nickserv]

I've noticed that while the Yarn modern website has cleared up most of the confusion I've had about differences with yarn classic, there still seems to be some inconsistency around what we call modern versions of Yarn. Notable the website calls it modern or just Yarn, but the repository on GitHub is still called berry from the early days of the development fork. I think it would reduce confusion in users that are migrating or considering migrating if we either make the difference between Yarn modern and berry more clear, or removed the difference entirely by using one term consistently.

[Haroenv]

cc @arcanis