[MAINT] clean up

[Remi-Gau]

• drop seaborn as dependency (not used by package but by examples)
• make sure example and test outputs are saved in a single folder
• clean up doc conf
• update changelog
• add type annotations
• use rich for progress bar

[codecov-commenter]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (master@6ab9d13). Click here to learn what that means.

Files	Patch %	Lines
neurodesign/classes.py	65.38%	9 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff            @@
##             master      #19   +/-   ##
=========================================
  Coverage          ?   85.51%           
=========================================
  Files             ?        5           
  Lines             ?      842           
  Branches          ?        0           
=========================================
  Hits              ?      720           
  Misses            ?      122           
  Partials          ?        0           

Flag	Coverage Δ
macos-latest_3.10	85.51% <70.00%> (?)
macos-latest_3.11	85.51% <70.00%> (?)
macos-latest_3.12	85.51% <70.00%> (?)
macos-latest_3.8	85.51% <70.00%> (?)
macos-latest_3.9	85.51% <70.00%> (?)
ubuntu-latest_3.10	85.51% <70.00%> (?)
ubuntu-latest_3.11	85.51% <70.00%> (?)
ubuntu-latest_3.12	85.51% <70.00%> (?)
ubuntu-latest_3.8	85.51% <70.00%> (?)
ubuntu-latest_3.9	85.51% <70.00%> (?)
windows-latest_3.10	85.47% <70.00%> (?)
windows-latest_3.11	85.47% <70.00%> (?)
windows-latest_3.12	85.47% <70.00%> (?)
windows-latest_3.8	85.47% <70.00%> (?)
windows-latest_3.9	85.47% <70.00%> (?)

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