website/integrations: Correct Discord avatar code and add warning.

[Aterfax]

Details

There's a mispelling which causes the avatar gathered to not be the desired size.

Additionally, larger avatars appear to cause "Header too large" errors when users attempt to access services (at least for me via a proxy provider.)

This can also be seen users have a very large JWT in their request headers. (You can use https://github.com/traefik/whoami for debugging).

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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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[netlify]

✅ Deploy Preview for authentik-docs ready!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.77%. Comparing base (b301048) to head (a9c5cbd).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11031      +/-   ##
==========================================
+ Coverage   92.76%   92.77%   +0.01%     
==========================================
  Files         736      736              
  Lines       36422    36422              
==========================================
+ Hits        33786    33791       +5     
+ Misses       2636     2631       -5     

Flag	Coverage Δ
e2e	49.26% <ø> (ø)
integration	25.01% <ø> (ø)
unit	90.25% <ø> (+0.01%)	⬆️

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