simplify config

[jla-gardner]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 89.91597% with 12 lines in your changes missing coverage. Please review.

Project coverage is 92.69%. Comparing base (e200d65) to head (5c41377).

Files	Patch %	Lines
src/graph_pes/config/spec.py	73.33%	8 Missing ⚠️
src/graph_pes/config/utils.py	93.10%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
+ Coverage   91.85%   92.69%   +0.84%     
==========================================
  Files          36       39       +3     
  Lines        2038     2054      +16     
==========================================
+ Hits         1872     1904      +32     
+ Misses        166      150      -16     

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