Executed the cell_segmentation.ipynb notebook for cell segmentation with watershed and background subtraction.

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Executed the Jupyter notebook cell_segmentation.ipynb, which includes the implementation of cell segmentation using a white top-hat background subtraction and a marker-based watershed algorithm. This notebook also conducts measurements of segmented cell areas using the image "membranes.png" stored in the data folder.

During solving this task, the following errors occurred:

• Error processing notebooks/cell_segmentation.ipynb: File already exists.
• Error processing data/membranes.png: File already exists.

closes #17