chore: document credentials server

[crenshaw-dev]

A contributor was asking about this struct in Slack. It's a confusing area of the code, I think the docstring is justified.

[bunnyshell]

✅ Preview Environment deployed on Bunnyshell

Component	Endpoints
argocd	https://argocd-472p7k.bunnyenv.com/
argocd-ttyd	https://argocd-web-cli-472p7k.bunnyenv.com/

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[bunnyshell]

✅ Preview Environment created on Bunnyshell but will not be auto-deployed

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.82%. Comparing base (0710ff9) to head (ffe762e).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #20078   +/-   ##
=======================================
  Coverage   55.81%   55.82%           
=======================================
  Files         320      320           
  Lines       44431    44431           
=======================================
+ Hits        24800    24802    +2     
- Misses      17066    17068    +2     
+ Partials     2565     2561    -4     

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