refactor: remove old taxonomy page route

[rpenido]

This PR removes the redirect from /taxonomy-list (used by Studio at the time) to /taxonomies (new, renamed route).

The change in Studio was made in the following commit:

• openedx/openedx-platform@6763928

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (master@0814022). Click here to learn what that means.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #954   +/-   ##
=========================================
  Coverage          ?   92.09%           
=========================================
  Files             ?      634           
  Lines             ?    11079           
  Branches          ?     2383           
=========================================
  Hits              ?    10203           
  Misses            ?      847           
  Partials          ?       29           

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[ChrisChV]

@rpenido Looks good 👍

• I tested this: I tested that the route is removed
• I read through the code and considered the security, stability and performance implications of the changes.

[openedx-webhooks]

@rpenido 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.

[bradenmacdonald]

Thanks for making this cleanup @rpenido :)