## 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
Strategized with @balazsorban44 to open one larger PR, with changes to individual examples as separate commits.
For each example, I researched how multiple realworld codebases use the featured technology with TypeScript, to thoughtfully convert them by hand - nothing automated whatsoever.
## Documentation / Examples
- [X] Make sure the linting passes by running `pnpm lint`
- [X] The "examples guidelines" are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md)
The [correct](https://www.grammarly.com/blog/et-cetera-etc/) way to use et cetera is to put a period right after and a comma behind it if it's being used as a list. I updated the occurrences in the docs and examples that didn't match these rules.
## Documentation / Examples
- [x] Make sure the linting passes
In line with the PR #27297 which solved issue #27252, this updates the example to also use named functions in order to pass ESLint
* added layout component example
* coding style fixes
* trailing spaces removed
* updated README file
* added layout example in docs
* moved .babelrc so that it handles all projects from the examples folder
