rm the use of deepcopy for rng and polish documentation in ReadMe

[Fe-r-oz]

• The code is properly formatted and commented.
• Substantial new functionality is documented within the docs.
• All new functionality is tested.
• All of the automated tests on github pass.
• We recently started enforcing formatting checks. If formatting issues are reported in the new code you have written, please correct them.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.49%. Comparing base (7db9f2d) to head (8ca17e6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #48   +/-   ##
=======================================
  Coverage   95.49%   95.49%           
=======================================
  Files           7        7           
  Lines         754      754           
=======================================
  Hits          720      720           
  Misses         34       34           

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