[Hotfix] Deletion of remaining Cython lines

[nariman87]

Context for changes

In #119, we have removed our Cython example and instructions. However, I have missed removing Cython tests in parts of the code, specifically main __init__.py. These are now all removed in this PR.

• Improvements:
  • Our Cython example and instructions were removed on [Frozen Period] Special Release, August 2022 #119, however, there were some leftover Cython tests in parts of the code including main __init__.py. These unnecessary Cython lines are now fully removed.

Example usage and tests

• Not Applicable

Performance results justifying changes

• Not Applicable

Workflow actions and tests

• Not Applicable

Expected benefits and drawbacks

Expected benefits:

• All unnecessary Cythin lines were removed.

Related Github issues

Relates to #119.

Checklist and integration statements

• My Python and C++ codes follow this project's coding and commenting styles as indicated by existing files. Precisely, the changes conform to given black, docformatter and pylint configurations.
• I have performed a self-review of these changes, checked my code (including for codefactor compliance), and corrected misspellings to the best of my capacity. I have synced this branch with others as required.
• I have added context for corresponding changes in documentation and README.md as needed.
• I have added new workflow CI tests for corresponding changes, ensuring codecoverage is 95% or better, and these pass locally for me.
• I have updated CHANGELOG.md following the template. I recognize that the developers may revisit CHANGELOG.md and the versioning, and create a Special Release including my changes.

[codecov]

Codecov Report

Merging #122 (ead00b3) into main (88b7d17) will increase coverage by 0.03%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
+ Coverage   96.00%   96.03%   +0.03%     
==========================================
  Files          37       37              
  Lines        2425     2423       -2     
==========================================
- Hits         2328     2327       -1     
+ Misses         97       96       -1     

Impacted Files	Coverage Δ
flamingpy/__init__.py	100.00% <ø> (+3.12%)	⬆️
flamingpy/_version.py	100.00% <100.00%> (ø)

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