Remove inkex.py and add comment to documentation

Ishaan Arorarequested to merge
pulsar17/extensions:remove-inkex-py into master

What does the merge request do?

This MR removes inkex.py (Discussion in !446 (merged)) ...

Implementation notes

Summary for release notes

...

Checklist

  • Add unit tests (if applicable)
  • Changes to inkex/ are well documented
  • Clean merge request history

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