[Docs] yarn berry installation

[fulldecent]

Prerequisites

• I have searched for duplicate or closed feature requests
• I have read the contributing guidelines

Proposal

The install documentation explains how to set up with yarn.

Please also explain how to set up with yarn berry.

Motivation and context

This setup is non-trivial. I am several days into learning the difference between sass/sass-loader and how to make it work with Yarn Berry.

Good documentation here might help many people.

Also

That page links to https://github.com/twbs/bootstrap-npm-starter which is archived and it references Node SASS which is also archived.

Perhaps this further illustrates how non-trivial this is.