Ignore doc paths for code CI

[t-young31]

Resolves #230

To speed up PR checks if only documentation is being updated

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Checklist

• [x] The changes include an associated explanation of how/why
• [x] Test pass
• [x] Documentation has been updated

[codecov[bot]]

Codecov Report

Merging #235 (10429e7) into v1.3.5 (6813afd) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           v1.3.5     #235   +/-   ##
=======================================
  Coverage   97.13%   97.13%           
=======================================
  Files         196      196           
  Lines       20131    20131           
=======================================
  Hits        19554    19554           
  Misses        577      577           

Flag	Coverage Δ
unittests	97.13% <ø> (ø)

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