examples: improve with-supabase example

[dijonmusters]

What?

1. Opt App Router examples out of routing:
2. Follow Supabase directory convention for init and seed scripts

Why?

1. Example routes are being rendered and fail if the user has not run the seed step of the README.md
2. SQL statements are in README.md

How?

1. Move all example routes under /app/_examples/
2. Move structural SQL statements to /supabase/migrations/...init.sql and seed ones to /supabase/seed.sql

[ijjk]

Allow CI Workflow Run

• approve CI run for commit: 4ca212d

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer

[vercel-spaces]

Notifying the following users due to files changed in this PR:

@timneutkens, @ijjk, @shuding, @huozhi, @feedthejim:

examples/with-supabase/README.md
examples/with-supabase/app/_examples/client-component/page.tsx
examples/with-supabase/app/_examples/protected-route/page.tsx
examples/with-supabase/app/_examples/route-handler/route.ts
examples/with-supabase/app/_examples/server-action/page.tsx
examples/with-supabase/app/_examples/server-component/page.tsx
examples/with-supabase/app/layout.tsx
examples/with-supabase/app/login/page.tsx
examples/with-supabase/app/logout-button.tsx
examples/with-supabase/app/page.tsx
examples/with-supabase/public/book.svg
examples/with-supabase/public/code.svg
+5 more

This comment was posted based on the notify modifier.