website/integrations: jellyfin: add OIDC configuration

[Redlonghead]

Details

I added the OIDC configuration for Jellyfin so others would more likely see that they can do this option for SSO.

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

• [X] The documentation has been updated
• [X] The documentation has been formatted (make website)

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.64%. Comparing base (837a032) to head (e3c42e1). Report is 59 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9538   +/-   ##
=======================================
  Coverage   92.64%   92.64%           
=======================================
  Files         713      713           
  Lines       34889    34894    +5     
=======================================
+ Hits        32322    32327    +5     
  Misses       2567     2567           

Flag	Coverage Δ
e2e	49.63% <ø> (-0.01%)	:arrow_down:
integration	25.47% <ø> (-0.01%)	:arrow_down:
unit	90.11% <ø> (+<0.01%)	:arrow_up:

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[dominic-r]

@Redlonghead