Setup an authentication repository

[mboyamike]

We should set up an authentication repository that uses supabase and supports the following

1. Sign in (and sign up) with email and password
2. Sign in with Google
3. Sign in with Apple

[Mohiit70]

Great idea but we need to Obtain project URL and public API key from the Supabase

[mboyamike]

On the pipeline is adding the getting started section :)

I'd prefer if those were set in a .env file so that contributors can each connect to their supabase projects. The code works generally the same, with the only difference being the keys

This would save us from having to invite all possible contributors to the supabase project and potentially opening it up to abuse