Update notebook

The cells related to 'Install packages if running in Colab' have been removed, as the Topfarm installation is already complete and no further installation is necessary.

Additionally, the cell for determining the exclusion zone has been modified to ensure compatibility with any version of Matplotlib. Variations in contour level handling and data precision across different Matplotlib versions can lead to inconsistencies in the number of paths generated by contour(). This modification addresses the related errors effectively.