Add .toml and .cff rules to .editorconfig, and clean up file comments

[mhucka]

This adds a missing indentation rule for .toml files, and adds .cff to the YAML section.

Also, this PR removes needless comments and comment verbosity.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.63%. Comparing base (aa9a4da) to head (cf6b071).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7994      +/-   ##
==========================================
- Coverage   99.63%   99.63%   -0.01%     
==========================================
  Files        1110     1110              
  Lines       99749    99749              
==========================================
- Hits        99388    99387       -1     
- Misses        361      362       +1     

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