chore: drop unused config + unused k8s file

[jennifer-richards]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.48%. Comparing base (e502e1e) to head (fd689fd).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10828      +/-   ##
==========================================
- Coverage   88.48%   88.48%   -0.01%     
==========================================
  Files         332      332              
  Lines       44838    44837       -1     
==========================================
- Hits        39676    39675       -1     
  Misses       5162     5162              

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[jennifer-richards]

Converted to draft - apparently the secrets.yaml + readme in the k8s/ directory are meant to be there as examples. Planning to add the readme back with the secrets.yaml in the readme instead of as a separate yaml file. That will help avoid the impression that the example file might be in use.