Chore: Improve onboarding

[dijonmusters]

• improve readme steps and package.json scripts for onboarding
• replace supabase.auth.getSession with supabase.auth.getUser to ensure jwt is validated
• add config.toml to configure local supabase automatically

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[dijonmusters]

cc: @dalkommatt @chriscarrollsmith @thorwebdev

[chriscarrollsmith]

@dijonmusters since you removed the supabase init step and prefilled config.toml, I ran into this error message when I tried to start a local Supabase instance:

'Error evaluating "env(SUPABASE_AUTH_EXTERNAL_GITHUB_CLIENT_ID)": environment variable SUPABASE_AUTH_EXTERNAL_GITHUB_CLIENT_ID is unset.'

When I run supabase init, my config.toml generates with "env(SUPABASE_AUTH_EXTERNAL_APPLE_SECRET)" instead of Github. Not sure why, because Github is actually what I use for Supabase login, not Apple. But anyway, pre-generating config.toml seems like it may not be fully reliable.

[chriscarrollsmith]

Ohhh, never mind; I just noticed that there's a new, separate .env file that controls this.