Migrate Python Mode Hosting from Linode to Netlify

[SableRaf]

Problem

Python Mode files, required by the Contribution Manager, are currently found at:

For Processing 3: https://contribs.processing.org/pythonmode/3/PythonMode.zip
For Processing 4: https://contribs.processing.org/pythonmode/4/PythonMode.zip

This points to a backup Linode VPS that was spun up as a temporary fix. This is not a long-term solution.

Proposed solution

Deploy Python Mode to Netlify.