Allow to create a production build about storybook

[thani-sh]

Almost done just need to cleanup the code a bit.

[arunoda]

This is implemented.

[crashuniverse]

@adyz https://storybook.js.org/basics/exporting-storybook/

{
  "scripts": {
    "storybook": "build-storybook -c .storybook -o .out"
  }
}

[thani-sh]

I have a working version here. I'm not that familiar with webpack so someone should take a look.

[adyz]

I found this issue looking for documentation, if this is implemented, can anybody post a link to the documentation? Thank you!