Update VORTEX demo and README

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[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.11 🎉

Comparison is base (5cca660) 72.24% compared to head (e8a5538) 72.35%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
+ Coverage   72.24%   72.35%   +0.11%     
==========================================
  Files          75       75              
  Lines        5263     5263              
  Branches     1073     1073              
==========================================
+ Hits         3802     3808       +6     
+ Misses       1108     1106       -2     
+ Partials      353      349       -4     

Flag	Coverage Δ
unittests	72.27% <ø> (+0.03%)	⬆️

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see 3 files with indirect coverage changes

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