Use mdformat instead of prettier

[blink1073]

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[codecov-commenter]

Codecov Report

Base: 72.51% // Head: 72.57% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (f564cff) compared to base (31cdf4d).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1022      +/-   ##
==========================================
+ Coverage   72.51%   72.57%   +0.06%     
==========================================
  Files          64       64              
  Lines        8251     8251              
  Branches     1257     1257              
==========================================
+ Hits         5983     5988       +5     
+ Misses       1852     1848       -4     
+ Partials      416      415       -1     

Impacted Files	Coverage Δ
jupyter_server/services/kernels/handlers.py	58.83% <0.00%> (+1.03%)	⬆️

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