direct logs to stdout

[ohana54]

Issue: #14621

What I did

Changed the default log output to stdout.
For npm, making the default stderr makes sense (as the maintainers claim), but I believe this is not true for storybook.

I didn't add tests as we mock npmlog in the logger tests, let me know if we need to add a test and what would be the preferred approach.

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

[yannbf]

Hey @ohana54 thanks for your contributiont! @ndelangen would you mind taking a look at this? thanks!