Add informations on how to install a local copy of Keystone

[anthonyivol]

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Name	Status	Preview	Updated
keystone-next-docs	✅ Ready (Inspect)	Visit Preview	Aug 17, 2022 at 8:55AM (UTC)

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[dcousens]

Hi @anthonyivol,

I appreciate the effort you have put into this pull request, but I don't know if we want to encourage or try and maintain instructions of how to "Installing and linking a local copy (or fork) of the keystone-6/* monorepo for local development in an external project.".

Thanks to your contribution, the instructions in this pull request will help users who are trying to search for how to do this, but I don't think I would merge this pull request as is.

Maybe if someone finds this helpful, please leave feedback on this pull request and I will happily reconsider :yellow_heart: