v1.0.4 release prep

[JesseCoretta]

Changes

• sort.Interface qualification, allowing basic sort operations for Stack instances
  • Added Stack.Swap(int, int) and Stack.Less(int, int) bool methods
  • Added Stack.SetLessFunc(...func(int, int) bool) Stack method to allow sort closure submission by adopters
  • Included a package-default sorter based on slice string representation, if available
• Documentation updates
• Removed Experimental badge from README.md 🥳
• Removed unneeded (commented-out) code

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (88b62cd) to head (636801a).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #10   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines         2257      2326   +69     
=========================================
+ Hits          2257      2326   +69     

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