Remove role="banner" from banner

[dreyfus92]

What kind of changes does this PR include?

• Minor content fixes (broken links, typos, etc.)

Description

• Closes # Product Hunters banner should sit outside <main> #706
• What does this PR change? Give us a brief description.
  Just removed the role of the banner as requested on that issue.

[changeset-bot]

🦋 Changeset detected

Latest commit: fabf376

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

This PR includes changesets to release 1 package

Name	Type
@astrojs/starlight	Patch

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[HiDeoo]

Thanks for the pull request 🙌

This may need a changeset, someone could have for some reason used a CSS selector like [role=banner]?

[dreyfus92]

Thank you for the review @HiDeoo 😁

[delucis]

LGTM! 🚀