Removal of poseidon from CodeEntropy:

- Removed the everything in the CodeEntropy/poseidon/ directory
- Removed the CodeEntropy/PoseidonHelper.py file
- Resolved issue #52 of local variables being assigned and not used
 - Removal of poseidon got rid of most of the warnings
 - One variable that was assigned but not used within Example/create_new_universe.py has been commented out
- Due to issue #52 being resolved the extend-ignore case for variables assigned but never used (F841) has been removed from the pyproject.toml file

Author: harryswift01