Supabase Examples

# Current
- supabase-js-v2 examples
- supabase-flutter-v1 examples

# Deprecated
- supabase-js-v1 - examples
- supabase-flutter-v0 examples

Tasks:

• Migrate the current examples into this repo
• Update the homepage "Examples" section to point to this repo
• Update app.supabase.com examples
• Update the links in our docs: https://supabase.com/docs/guides/examples
• Remove the old /supabase/examples folder
• Recreate the supabase-js-v2 user-managemet examples
• Update the vercel Next.js Subscription and Auth to use v2 (After release)