Update singlecell and sequence-stimuli example

[darshanmandge]

Updated the single cell and sequence stimuli example to have some better figures.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.23%. Comparing base (de7f7ae) to head (3bf0e54).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #173   +/-   ##
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  Coverage   91.23%   91.23%           
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  Files          95       95           
  Lines        5626     5626           
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  Hits         5133     5133           
  Misses        493      493           

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[anilbey]

Thanks a lot @darshanmandge all good to me