close #8830

## Changes

- [x] Remove _app.js usage
- [x] Migrate withRedux HOC to functional component
- [x] Add correct display name
- [x] Remove abstractions/boilerplate from example
- [x] Add useInterval HOC from Dan

* Update redux example with hooks api

* Update react and react-redux package

* Apply standard style

* 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

Adding one more example which only uses redux and not thunk. This helps a lot for a beginner to understand basic redux first.

* Add prettier for examples directory

* Fix files

* Fix linting

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

It's better that Counter behave not only `increment (add)` but also `decrement` or `reset`.

* Add decrement, reset handlers and rename add handler in `components/counter.js`
* Add increment, decrement, reset actions to `store.js`
* Rename page component class name: Counter => Index in `pages/index.js`
* Remove needless dispatch count event on getInitialProps in `pages/index.js`
* Format JSX to be readable in `pages/_app.js`
* Remove needless line from `components/examples.js`
* Remove needless spaces in `lib/with-redux-store.js`

* Simplify redux example

* Simplify redux example even more

* Remove empty space