🔨 Rename mixins module to model_mixins for clarity

[jambonrose]

No description provided.

[codecov]

Codecov Report

Merging #96 into development will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           development    #96   +/-   ##
==========================================
  Coverage          100%   100%           
==========================================
  Files                9      9           
  Lines              175    175           
  Branches            11     11           
==========================================
  Hits               175    175

Impacted Files	Coverage Δ
src/improved_user/model_mixins.py	100% <ø> (ø)
src/improved_user/models.py	100% <100%> (ø)	⬆️

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