Add documentation for using the Keystone GraphQL API from an example frontend

[Noviny]

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This has two things, one of which will be removed:

• The document that has a guide on setting up a frontend with keystone

• the KS example that this builds

• [x] move the KS example into its own repo so it can be referenced

• [ ] Another editing pass to make sure things make sense

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Latest commit: 2cc10e199516f9fec83ecaa529429d39ee560e36

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Name	Status	Preview	Updated
keystone-next-docs	✅ Ready (Inspect)	Visit Preview	May 11, 2022 at 5:41AM (UTC)