[GregFa]

This PR improves the package documentation, testing, and result presentation. It:

• Adds StableRNGs.jl to make documentation examples reproducible.
• Adds show.jl with custom display methods.
• Adds tests for the new show methods.
• Expands the documentation to show more intermediate results.
• Adds real-data application examples.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (3707588) to head (fbecbfd).
⚠️ Report is 37 commits behind head on joss-submission.

Additional details and impacted files

@@                Coverage Diff                @@
##           joss-submission       #60   +/-   ##
=================================================
  Coverage           100.00%   100.00%           
=================================================
  Files                   15        16    +1     
  Lines                  387       420   +33     
=================================================
+ Hits                   387       420   +33     

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