[Feature] Add a broken link checker to the CI/CD pipeline

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Feature suggestion

Relates to my https://github.com/a11yproject/a11yproject.com/issues/1478#issuecomment-1443601296. Potentially implement something like https://github.com/marketplace/actions/broken-link-checker-action to improve the process.

Terms

• I have read, and agree to follow this project's Code of Conduct