docs: sys mgmt: document authentik backups

[dominic-r]

Details

What?

This PR documents the process of backing up authentik by providing commands for K8s deployments as well as docker compose deployments. It includes commands to dump the postgres database to a .sql file on disk (which the user will then backup normally), mentions backup of /media, /certs, /custom-templates which are all supposed to be mounted on host system or as a volume thingy. More details TBD. I'll go with the flow

Closes

Closes #8411

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Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make website)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.69%. Comparing base (26a08fc) to head (178eb49).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12943      +/-   ##
==========================================
- Coverage   92.70%   92.69%   -0.01%     
==========================================
  Files         785      785              
  Lines       39580    39580              
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- Hits        36692    36689       -3     
- Misses       2888     2891       +3     

Flag	Coverage Δ
e2e	48.42% <ø> (-0.06%)	⬇️
integration	24.54% <ø> (ø)
unit	90.43% <ø> (+<0.01%)	⬆️

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