fix(AnchoredOverlay): replace broken stories

[francinelucca]

Relates to https://github.com/github/primer/issues/3420

Current AnchoredOverlay stories using placekitten are broken due to the site no longer being available. Replaced with a hovercard example (modeled after mona) as suggested here.

Changelog

Changed

• Replace all usages of placekitten.com with hovercard example

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

docs only update

Testing & Reviewing

N/A

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	96.87 KB (0%)
packages/react/dist/browser.umd.js	97.19 KB (0%)

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[mperrotti]

I'd recommend using the size prop instead.

Suggested change

	<Text fontSize={14}>Former beach cat and champion swimmer. Now your friendly octapus with a normal face.</Text>
	<Text size="medium">Former beach cat and champion swimmer. Now your friendly octapus with a normal face.</Text>

Same goes for other places where you're using Text to set the size.

[francinelucca]

ah perfect, will do! thankss 🙏🏼