Add utilities to Storybook

[simurai]

What are you trying to accomplish?

This is part of primer/design#364 and adds the utilities to Storybook.

👀 Preview

What approach did you choose and why?

It will allow the utilities to be embedded in the new unified docs.

What should reviewers focus on?

There are some small improvements here and there but the migration is mostly kept as is.

Tasks

• Animations
• Borders
• Box shadow
• Colors
• Details
• Flexbox
• Grid
• Layout
• Margin
• Padding
• Typography

Can these changes ship as is?

• Yes, this PR does not depend on additional changes. 🚢

[changeset-bot]

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Latest commit: b47c599

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