website/integrations: update argocd oidc doc

[ImOverlord]

Details

Add signing_key to terraform example as it is needed for ArgoCD. They require a RS256 key and without it you get a HS256 key

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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 92.76%. Comparing base (29f8a82) to head (464cdc7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12637      +/-   ##
==========================================
+ Coverage   92.75%   92.76%   +0.01%     
==========================================
  Files         769      769              
  Lines       38840    38840              
==========================================
+ Hits        36025    36031       +6     
+ Misses       2815     2809       -6     

Flag	Coverage Δ
e2e	48.63% <ø> (+0.02%)	⬆️
integration	24.63% <ø> (ø)
unit	90.39% <ø> (+<0.01%)	⬆️

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