Remove non-functional JSON-dependent remnants

[oschulz]

Closes #29 .

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.33%. Comparing base (a2d3f2a) to head (e4eefcd).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
+ Coverage   81.75%   82.33%   +0.57%     
==========================================
  Files           6        6              
  Lines         285      283       -2     
==========================================
  Hits          233      233              
+ Misses         52       50       -2     

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