Cleanups.

[delucchi-cmu]

Change Description

While implementing SOAP (source-object-association-pipeline), I came across some affiliated cleanups.

• Uses the Healpix API for visualize catalog method, to simplify code experience
• Conversion for PixelAlignment dataframe to integer types
• black formatting
• fixed warnings when rendering RTD bulleted lists

Code Quality

• I have read the Contribution Guide
• My code follows the code style of this project
• My code builds (or compiles) cleanly without any errors or warnings
• My code contains relevant comments and necessary documentation

[codecov]

Codecov Report

Merging #115 (6fca3cf) into main (6125aa8) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
- Coverage   99.85%   99.85%   -0.01%     
==========================================
  Files          45       45              
  Lines        1412     1410       -2     
==========================================
- Hits         1410     1408       -2     
  Misses          2        2              

Impacted Files	Coverage Δ
src/hipscat/pixel_tree/pixel_tree.py	100.00% <ø> (ø)
...catalog/association_catalog/association_catalog.py	100.00% <100.00%> (ø)
src/hipscat/inspection/visualize_catalog.py	100.00% <100.00%> (ø)
src/hipscat/pixel_math/healpix_pixel.py	100.00% <100.00%> (ø)
src/hipscat/pixel_tree/pixel_alignment.py	100.00% <100.00%> (ø)

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