chore: docs starter

[snowystinger]

Closes
Have docs starter be a source of truth instead of writing lots of strange code to extract it from the docs.

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project:

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[devongovett]

Thanks for working on this! The real icons definitely make the design look a lot better ❤️

I think there are probably a few more common components we can share in some places. Left a few comments but there are probably others.

A few places are also still depending directly on the CSS rather than the component.

Let's also make sure we're exporting styled components for all the pieces. The stories should probably not be importing directly from react-aria-components and relying on the CSS. They should import styled components from src. I think that would match more closely with how we'd recommend using RAC.

[devongovett]

wonder if this should be specific to toolbar or pulled out into a general Separator component?

[snowystinger]

I think i'd opt to leave it as is for the moment, we didn't reuse it in S2 as much either and none of the other stories/components are currently using this

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