Provide YAML config by default

[dalyIsaac]

Whim now creates a YAML config if one doesn't exist during startup. The docs have been updated to reflect that YAML is now the default option.

Existing configs are not overwritten.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 80.58%. Comparing base (fe8e309) to head (ff6425e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Whim/ConfigLoader/ConfigLoader.cs	0.00%	11 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1067   +/-   ##
=======================================
  Coverage   80.57%   80.58%           
=======================================
  Files         283      283           
  Lines       12419    12418    -1     
  Branches     1434     1434           
=======================================
  Hits        10007    10007           
+ Misses       2227     2226    -1     
  Partials      185      185           

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