Add a NextJS example using Supabase Auth with `getContext`

[borisno2]

Supabase Auth

This example uses Supabase auth to create and log in the users. Demonstrating how to use a Supabase session within Keystone and NextJS

You can then use Supabase as the Postgres Server that Keystone connects to.

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Latest commit: 02f073ab4f88aea3135f550501ec5c6adb20a405

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