## 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
* Remove outdated examples
* Remove outdated example
* Remove outdated example that doesn't show best practices
* Remove outdated example
* Remove outdated example
* Remove outdated example
* Update preact example
* Update using-router to use useRouter
* Remove outdated example
* Remove outdated example
* Remove outdated example
* Remove outdated example
* Remove outdated example
* Remove outdated example
* Combine examples
* Simplify offered examples
* Remove outdated example
* Add link to new example
* Removed outdated example
* Markdown example has been improved
* Remove example that showed bad practices
* Remove outdated example
* Update polyfills example
* Remove outdated example
* Remove outdated example
* Remove outdated example
* Removed outdated example
* Remove outdated example
* Remove outdated example
* Remove outdated example
* Remove outdated example
* Update webassembly example
* Move example
