Implement nuclei segmentation using Voronoi-Otsu-Labeling (Issue #7)

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This pull request implements nuclei segmentation using Voronoi-Otsu-Labeling as requested in issue #7. A Jupyter notebook nuclei_segmentation.ipynb has been created, which loads the human_mitosis_small.png image, applies the segmentation algorithm, and saves the result as an RGB PNG. The notebook includes code for visualization using stackview.animate_curtain(), although there seems to be an error in its execution. The requirements.txt file has been updated to include jupyter. The original image and the resulting segmentation can be found in the repository.

Link to nuclei_segmentation.ipynb

closes #7

[haesleinhuepf]

There was an error in the notebook. Modify it like this. After loading the image, only work with the first channel. Extract it using the [..., 0] syntax.

git-bob implement this.

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I apologize, but there are no commit messages provided in the given information. Without any specific commit messages or file changes to summarize, I cannot generate a meaningful paragraph summarizing the changes. If you have specific commit messages or file changes you'd like me to summarize, please provide those details and I'll be happy to assist you.

During solving this task, the following errors occurred:

• Error during {'action': 'modify', 'filename': 'nuclei_segmentation.ipynb'}: Error during notebook execution: [Errno 13] Permission denied: '/human_mitosis_small.png'

      Traceback (most recent call last):
      File "/home/runner/work/git-bob-playground/git-bob-playground/git-bob/src/git_bob/_ai_github_utilities.py", line 353, in create_or_modify_file
        write_file_in_branch(repository, branch_name, f"{path_without_filename}/{file}", file_content2, f"Adding {path_without_filename}/{file} created by notebook")
      File "/home/runner/work/git-bob-playground/git-bob-playground/git-bob/src/git_bob/_github_utilities.py", line 365, in write_file_in_branch
        with open(file_path, "wb") as f:
             ^^^^^^^^^^^^^^^^^^^^^
    PermissionError: [Errno 13] Permission denied: '/human_mitosis_small.png'
  During handling of the above exception, another exception occurred:
  Traceback (most recent call last):
  
  File "/home/runner/work/git-bob-playground/git-bob-playground/git-bob/src/git_bob/_ai_github_utilities.py", line 474, in solve_github_issue
  
  message = filename + ":" + create_or_modify_file(repository, issue, filename, branch_name, discussion,
  
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  
  File "/home/runner/work/git-bob-playground/git-bob-playground/git-bob/src/git_bob/_ai_github_utilities.py", line 357, in create_or_modify_file
  
  raise ValueError(f"Error during notebook execution: {e}")
  
  ValueError: Error during notebook execution: [Errno 13] Permission denied: '/human_mitosis_small.png'