Add PageHeader component

[pksjce]

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• [ ] Added/updated tests
• [ ] Added/updated documentation
• [ ] Tested in Chrome
• [ ] Tested in Firefox
• [ ] Tested in Safari
• [ ] Tested in Edge

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🦋 Changeset detected

Latest commit: 35542f8f293728997758d43dcb64a3ce845cf5e2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/react	Minor

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size-limit report 📦

Path	Size
dist/browser.esm.js	82.77 KB (0%)
dist/browser.umd.js	83.42 KB (0%)

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[broccolinisoup]

Sorry for the delay @broccolinisoup! Left a couple of comments/notes, also had a question around alignment, should the underline nav align here?

The spacing is still very arbitrary here. I'll get it cleared with design too.

[mperrotti]

@broccolinisoup - Katie already commented, but ignore any of my comments that suggest using any of the tokens from these two pages:

• https://primer.style/primitives/spacing
• https://primer.style/primitives/typography

There's an ADR PR open that will introduce breaking changes when the names change. We can come back to these styles and use the correct tokens once they're ready.