fix: prevent sitemap redirect loop

[nicholasio]

Description of the Change

Closes #714

How to test the Change

• npm run dev
• Visit http://localhost:3000/sitemap.xml and verify it works fine, as well as any other valid sitemap
• Visit a invalid sitemap e.g: http://localhost:3000/index-sitemap.xml and it should redirect to the homepage.

Checklist:

• [x] I agree to follow this project's Code of Conduct.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my change.
• [x] All new and existing tests pass.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: b4a27b92c1fbae6d4a9b14b92837204b99ba15bc

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

This PR includes changesets to release 1 package

| Name | Type | | ------------------------ | ----- | | @headstartwp/headstartwp | Patch |

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Name	Status	Preview	Comments	Updated (UTC)
headstarwp	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 2, 2024 1:44am

[github-actions[bot]]

📦 Next.js Bundle Analysis for @10up/headless_framework

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This PR introduced no changes to the JavaScript bundle! 🙌

[github-actions[bot]]

📦 Next.js Bundle Analysis for @10up/headless_framework

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌