Decommission old /leadership page template (Fixes #15135)

[alexgibson]

One-line summary

Removes old leadership page template

Issue / Bugzilla link

#15135

Testing

Remember to run make preflight to pull the latest dev DB.

• http://localhost:8000/en-US/about/leadership/ should still resolve to the CMS powered page

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.88%. Comparing base (2df9c9b) to head (d5af013).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15183   +/-   ##
=======================================
  Coverage   77.88%   77.88%           
=======================================
  Files         163      163           
  Lines        8480     8480           
=======================================
  Hits         6605     6605           
  Misses       1875     1875           

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[alexgibson]

Successful test run: https://github.com/mozilla/bedrock/actions/runs/10939389570

[reemhamz]

Hmm, this is the only thing I see on the page. It doesn't seem to resolve to the new CMS leadership page and made sure to run a make preflight. Is this something else I might be missing?

[alexgibson]

@reemhamz the localhost page should match what's on https://www-dev.allizom.org/en-US/about/leadership/ (we only include enough data on www-dev to satisfy integration tests).

See https://bedrock.readthedocs.io/en/latest/cms.html#i-ve-downloaded-a-fresh-db-and-the-images-are-missing for downloading images locally.

[reemhamz]

Giving this a front-end stamp of approval. 💯 r+
I'll leave this for you to merge in case