Update polygonise pixel edges notebook to use S2C

[biancafichera]

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Proposed changes

See title.

Closes issues (optional)

• Closes Issue #000

Checklist

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If this is a notebook, then have you:

• Checked the structure of the notebook follows our DEA-notebooks template
• Removed any unused Python packages from Load packages
• Removed any unused/empty code cells
• Removed any guidance cells (e.g. General advice)
• Ensured that all code cells follow the PEP8 standard for code. The jupyterlab_code_formatter tool can be used to format code cells to a consistent style: select each code cell, then click Edit and then one of the Apply X Formatter options (YAPF or Black are recommended).
• Included relevant tags in the final notebook cell (refer to the DEA Tags Index, and re-use tags if possible)
• Tested notebook on the DEA Sandbox
• Cleared all outputs, run notebook from start to finish, and save the notebook in the state where all cells have been sequentially evaluated
• If applicable, update the Notebook currently compatible with line below the notebook title to reflect the environments the notebook is compatible with
• Check for any spelling mistakes using the DEA Sandbox's built-in spellchecker (double click on markdown cells then right-click on pink highlighted words). For example:

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[robbibt]

This looks great @biancafichera! There was a small merge conflict caused by a change to develop branch that happened between you starting your changes and committing them... I think I've fixed it. All good to merge by selecting "Squash and merge" when you're ready!

[erialC-P]

@BexDunn did you mean to commit changes to the PR_Template into this branch? ;)

[erialC-P]

Also reviewed and it looks awesome @biancafichera !!

[biancafichera]

Thanks guys @robbibt and @erialC-P !
@robbibt Sorry about that, I had a few people helping me go through it, but we missed the step where you change the base branch to s2c_updates, but we were assured that if we edit and change it it shouldn't be an issue! I do hope it didn't cause much of an issue for you! I'll 'Squash and merge' now :)