chore: Delete CODEOWNERS

[kdmccormick]

See: openedx/axim-engineering#1511

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (715cc60) to head (e9f401b).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #461   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          107       107           
  Lines         1078      1078           
  Branches       159       160    +1     
=========================================
  Hits          1078      1078           

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