bdocs: script for auto-generating redirects + general improvements

[internetisaiah]

Why are you making this change? (required)

This PR contains some general improvements to bdocs that I did during my time off for fun (lol i know), as well as a new script for auto-generating the redirect file. Here's the requirements doc for more info.

TODO

• Have user confirm that they have already made a git commit with the changed files before running command. Git can only check if filenames have been changed for committed files, not merely touched/in staging.
• Cleanup comments/general structure (if applicable).

Related PRs, issues, or features (optional)

• N/A

Feature release date (optional)

• N/A

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).
  • If my PR is related to a paid SKU, third party, SMS, AI, or privacy, I have received written approval from Braze Legal.

Submitting for review

If your PR meets the above requirements, select Ready for review, then add a reviewer:

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Thanks for contributing! We look forward to reading your work.

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[internetisaiah]

Use the global vars!