fix: move Storybook to dev dependencies

[mdeliatf]

Description

This PR moves Storybook and related dependencies in the devDependencies section of the package.json.

Preview

How to test?

yarn storybook should work in the same way as before.

Good PR checkboxes

• Change has been tested
• Added/Updated tests
• Added/Updated stories
• PR follows conventions
• Labels are set
• Project is linked

Good Review checkboxes

ℹ️ Copy the snippet and paste in the review field to fill it

- [ ] I've tested the changes
- [ ] I've agreed on the unit tests (soon to come)
- [ ] I've checked the stories
- [ ] I've read the code and understood it
- [ ] I don't have any more questions
- [ ] I've described any optional improvements
- [ ] I checked PR follows [conventions](https://github.com/traefik/faency#how-to-contribute)

[gndz07]

LGTM

[traefiker]

🎉 This PR is included in version 12.0.9 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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