Release v0.19.0

[sr-murthy]

• Fix anomaly with simple form uniqueness of elements in ContinuedFraction.extend op (addresses issue fix: enforce simple form uniqueness in ContinuedFraction.extend op #127)
• Improvements and updates to the Sphinx docs
• Minor tweaks to the project TOML & Read the Docs build config.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ae37ed4) to head (b907273).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #126   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          375       377    +2     
  Branches        52        53    +1     
=========================================
+ Hits           375       377    +2     

Flag	Coverage Δ
unit	100.00% <100.00%> (ø)

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[sr-murthy]

Changes moved to release v0.18.1