Remove dockerfile from documentation

[4yman-0]

This Pull Request fixes/closes #4016.

It changes the following:

• CONTRIBUTING.md
• docs/debugging.md
  By removing all references to a Dockerfile that no longer exists.

Edit 1: Fix typo

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.88%. Comparing base (6ddc2b4) to head (72bd946).
Report is 295 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4046      +/-   ##
==========================================
+ Coverage   47.24%   52.88%   +5.64%     
==========================================
  Files         476      483       +7     
  Lines       46892    46947      +55     
==========================================
+ Hits        22154    24829    +2675     
+ Misses      24738    22118    -2620     

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[jedel1043]

Thank you!