feat: add docs for Typesense search backend (FC-0091)

[samuelallan72]

Description

Document how to get started with the new Typesense search backend, and some tips about clustered Typesense and using a web dashboard.

Supporting information

NOTE: the typesense search backend has not been merged yet, but it has been approved. Related work:

• https://github.com/open-craft/tutor-contrib-typesense
• feat: add Typesense backend for search (FC-0091) forum#225
• Typesense Backend [FC-0091] edx-search#222

Private-ref: https://tasks.opencraft.com/browse/BB-10458

Testing instructions

• view the rendered page from CI at: https://docsopenedxorg--1376.org.readthedocs.build/en/1376/site_ops/how-tos/use_typesense_search_backend.html
• verify everything is rendered correctly
• verify the information is accurate (cross reference with the above linked PRs and tutor plugin)
• verify the information is readable

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[bradenmacdonald]

Looks great! Just one suggestion.

[samuelallan72]

Thanks! I've rebased on main and squashed the commits. :)