Tidy up

[arafune]

• Update doc strings and others.
• Remove unused files
  • optics.py, exceptions.py, and images.py

[codecov]

Codecov Report

Attention: Patch coverage is 86.04651% with 6 lines in your changes missing coverage. Please review.

Project coverage is 49.94%. Comparing base (00dd825) to head (aa2ebfd).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/arpes/endstations/plugin/Phelix.py	0.00%	2 Missing ⚠️
src/arpes/endstations/plugin/ALG_spin_ToF.py	0.00%	1 Missing ⚠️
src/arpes/endstations/plugin/IF_UMCS.py	0.00%	1 Missing ⚠️
src/arpes/plotting/dispersion.py	0.00%	1 Missing ⚠️
src/arpes/simulation.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
+ Coverage   49.85%   49.94%   +0.09%     
==========================================
  Files         164      161       -3     
  Lines       13814    13744      -70     
==========================================
- Hits         6887     6865      -22     
+ Misses       6927     6879      -48     

Flag	Coverage Δ
unittests	49.94% <86.04%> (+0.09%)	⬆️

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