[Docs]: Update Supabase's docs to reference CedarJS instead of Redwood

[Tobbe]

Our docs at https://cedarjs.com/docs/how-to/supabase-auth link to Supabase's RW docs. We should update those docs, or create new ones, and link to Cedar docs instead

https://supabase.com/docs/guides/getting-started/tutorials/with-redwoodjs

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• I'm interested in working on this

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