start of doc work – focusing on locate docs

[jGaboardi]

This PR resolves #300 & resolves #304, and starts some basic cleanup in the region module.

xref #173, #280

[codecov]

Codecov Report

Merging #302 (35738e3) into main (b60c4db) will not change coverage.
The diff coverage is 100.0%.

@@          Coverage Diff          @@
##            main    #302   +/-   ##
=====================================
  Coverage   73.7%   73.7%           
=====================================
  Files         23      23           
  Lines       2421    2421           
  Branches     463     463           
=====================================
  Hits        1785    1785           
  Misses       578     578           
  Partials      58      58           

Impacted Files	Coverage Δ
spopt/locate/util.py	100.0% <ø> (ø)
spopt/region/azp.py	34.2% <ø> (ø)
spopt/region/base.py	97.6% <ø> (ø)
spopt/region/components.py	41.1% <ø> (ø)
spopt/region/csgraph_utils.py	100.0% <ø> (ø)
spopt/region/maxp.py	94.7% <ø> (ø)
spopt/region/objective_function.py	59.6% <ø> (ø)
spopt/region/region_k_means.py	98.7% <ø> (ø)
spopt/region/skater.py	82.3% <ø> (ø)
spopt/region/spenclib/abstracts.py	35.8% <ø> (ø)
... and 6 more