split into two examples

* Update `packages/`

* Update examples

* Update tests

* Update bench

* Update top level files

* Fix build

* trigger

* form handler example: Update deps and fix build from dep update

* Ran lint error fixers

* Fixes errors that occur when commit occurs

* Commit linter fixes

Adds a new example showing how to use the [Grommet UI library](https://grommet.io/) with Next.js.

`initialProps.styles` is a React node, but not guaranteed to be an
array, so we can use a fragment to concatenate additional styles.

See https://github.com/DefinitelyTyped/DefinitelyTyped/issues/32932#issuecomment-462372319

I was noticing some bad memory leak on my company's application and I ended up finding this github issue ( https://github.com/styled-components/styled-components/issues/1624 ) .

This comment ( https://github.com/styled-components/styled-components/issues/1624#issuecomment-425382979 ) caught my attention, which lead to this other issue on the repository of styled components website ( https://github.com/styled-components/styled-components-website/issues/329 )

After applying the changes on my project I noticed a huge improvement on memory consumption.

So would be nice to update the example or start a discussion on how to solve this properly 

* Add prettier for examples directory

* Fix files

* Fix linting

* Add prettier script in case it has to be ran again

- use `enhanceApp` so that styled-components used in _app.js are server rendered
- call parent getInitialProps, fixes #5629
- return `styles`, making the render() method obsolete.

cc @mxstbr @probablyup

* Fix linter

* Add test env

* Fix lint errors

* <title> should not be used in _document.js's

* fix style as it was

* Update styled components example

Updates the styled-components example to pass HOC to renderPage() and fix SSR.

* fix lint errors

* Added redux and styled components (wip) examples.

* Updated examples readmes and package.json

* Fixed styled-components example