add help cursor

[kevinlang]

Adds on to #679 to also have a help cursor utility.

There are a bunch of other cursors laid out in MDN docs, not sure if any of those would also be of use.
https://developer.mozilla.org/en-US/docs/Web/CSS/cursor

[codecov-io]

Codecov Report

Merging #3199 (bdba9c5) into master (523db03) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3199   +/-   ##
=======================================
  Coverage   93.28%   93.28%           
=======================================
  Files         178      178           
  Lines        1831     1831           
  Branches      324      324           
=======================================
  Hits         1708     1708           
  Misses        105      105           
  Partials       18       18           

Impacted Files	Coverage Δ
stubs/defaultConfig.stub.js	100.00% <ø> (ø)

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[adamwathan]

Hey! We deliberately limited which ones were enabled by default just to try and cut file size anywhere we could, but made sure it was customizable in the config file. I think it's probably fine to add this one by default though, thanks.