Loads of small cleanups

[delucchi-cmu]

Change Description

• creates a shared get_pixel_cache_directory, as we were duplicating logic in a few places (and there was a TODO)
• use HealpixPixel where possible
• remove all macauff references - the entire pipeline was moved to the macauff/lsdb_macauff repo a few weeks ago (LINK)
• removed pylint disablement statements where there's no pylint warning
• ran black and isort
• fix a few docstrings (pydoclint now reports "No violations"!)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3c87019) 99.45% compared to head (d19f59e) 99.74%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #203      +/-   ##
==========================================
+ Coverage   99.45%   99.74%   +0.28%     
==========================================
  Files          29       24       -5     
  Lines        1466     1166     -300     
==========================================
- Hits         1458     1163     -295     
+ Misses          8        3       -5     

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