Please describe the purpose of this Pull Request.

For new Sandbox app/role documentation, please confirm you have completed the following tasks:

- [] App documentation page created
- [] markdownlint reports no errors on edited page(s) - use <https://dlaa.me/markdownlint/> if your IDE does not have this built in
- [] Reference added in `docs/sandbox/index.md`
- [] Reference added in `mkdocs.yml` nav menu

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