update with-flow example

[Tomekmularczyk]

Changes:

• updated packages
• moved the content of layout to _app.js and created simple Page component
• replaced import * as React because it is not necessary to import everything
• moved next.js.flow to flow-typed as it is default directory for library definitions
• updated the gif

[vendramini]

@Tomekmularczyk could you answer to me, please?

If next.js injects React, why do we need to import it when enabling flow? Is mandatory?
I saw an error on IDE, but its compile well.

Can we avoid this import?

[Tomekmularczyk]

@Tomekmularczyk could you answer to me, please?

If next.js injects React, why do we need to import it when enabling flow? Is mandatory?
I saw an error on IDE, but its compile well.

Can we avoid this import?

Yeah, I think so, you can remove it ;)

[vendramini]

Is there some way to fix the IDE (PhpStorm) error? Because flow forces me to import it.
Maybe some rule in .flowconfig?

I know this is not the place to answer officially, but if you know I appreciate it.