fix for pkgdown forcing ANSI colors, which it can't render with comment=NA

[jgabry]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.50%. Comparing base (b22ea49) to head (36fe24a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #406   +/-   ##
=======================================
  Coverage   92.50%   92.50%           
=======================================
  Files          31       31           
  Lines        3107     3107           
=======================================
  Hits         2874     2874           
  Misses        233      233           

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