API and Documentation Overhaul

[vivekjoshy]

Description of Changes

• Wrote at least one-line docstrings (for any new functions)
• Added test(s) covering the changes (if testable)

Issues Resolved

Fixes #84 #88 #83 #85 #89 #53 #86

Affirmation

By submitting this Pull Request or typing my (user)name below,
I affirm the Developer Certificate of Origin
with respect to all commits and content included in this PR,
and understand I am releasing the same under openskill.py's MIT license.

I certify the above statement is true and correct: @vivekjoshy

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (366af29) 100.00% compared to head (7d145f9) 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #101     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
===========================================
  Files           11        10      -1     
  Lines          622      1764   +1142     
  Branches       149       450    +301     
===========================================
+ Hits           622      1764   +1142     

see 19 files with indirect coverage changes

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