Why are you making this change? (required)

Some general improvements to bdocs, as well as a new script that:

1. Checks to see if old links listed in assets/js/broken_redirect_list.js are linked in any pages in _docs.
2. If so, it replaces the old links found in _docs with the new link specified in the redirect file.

Related PRs, issues, or features (optional)

• N/A

Feature release date (optional)

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Contributor checklist

• I confirm that my PR meets the following:
  • I signed the Contribution License Agreement (CLA).
  • My style and voice follows the Braze Style Guide.
  • My content contains correct spelling and grammar.
  • All links are working correctly.
  • If I renamed or moved a file or directory, I set up URL redirects for each file.
  • If I updated or replaced an image, I did not remove the original image file from the repository. (For more information, see Updating an image).
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