website/integrations: nextcloud add back-channel logout documentation

[LuisThe0ne]

Details

This PR adds documentation on how to enable back-channel logout (automatically logging a user out of nextcloud when they log out of authentik using OIDC) for the nextcloud integration.

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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 and clients have been updated (make gen)

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 docs)

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[dominic-r]

Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.77%. Comparing base (a6e90eb) to head (8e7dcff).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21147      +/-   ##
==========================================
- Coverage   92.81%   92.77%   -0.05%     
==========================================
  Files        1000     1000              
  Lines       56627    56627              
  Branches      425      425              
==========================================
- Hits        52559    52535      -24     
- Misses       4068     4092      +24     

Flag	Coverage Δ
conformance	37.37% <ø> (+<0.01%)	⬆️
e2e	42.86% <ø> (+<0.01%)	⬆️
integration	22.16% <ø> (-0.05%)	⬇️
rust	0.23% <ø> (ø)
unit	91.71% <ø> (+<0.01%)	⬆️
unit-migrate	91.81% <ø> (ø)

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