## Description
This PR ensures that the default prettier config is used for examples
and templates.
This config is compatible with `prettier@3` as well (upgrading prettier
is bigger change that can be a future PR).
## Changes
- Updated `.prettierrc.json` in root with `"trailingComma": "es5"` (will
be needed upgrading to prettier@3)
- Added `examples/.prettierrc.json` with default config (this will
change every example)
- Added `packages/create-next-app/templates/.prettierrc.json` with
default config (this will change every template)
## Related
- Fixes#54402
- Closes#54409
### What?
Update Next.js with Supabase example
### Why?
Existing example for Next.js with Supabase is out of date
### How?
- Rename `with-supabase-auth-db-realtime` to `with-supabase`
- Update example to use App Router
- Use Supabase Auth Helpers for Next.js to configure auth cookies
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