Update gatsby in /docs from 1.9.184 to 1.9.187

[dependencies]

Dependencies.io has updated gatsby (a npm dependency in /docs) from "1.9.184" to "1.9.187".

1.9.187

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1.9.188

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1.9.185

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1.9.186

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[codecov]

Codecov Report

Merging #2950 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2950   +/-   ##
=======================================
  Coverage   37.37%   37.37%           
=======================================
  Files         426      426           
  Lines        9151     9151           
  Branches      872      874    +2     
=======================================
  Hits         3420     3420           
- Misses       5186     5206   +20     
+ Partials      545      525   -20

Impacted Files	Coverage Δ
app/react/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/utils.js	0% <0%> (-100%)	⬇️
app/react/src/server/babel_config.js	0% <0%> (-76.67%)	⬇️
...es__/update-addon-info/update-addon-info.output.js	0% <0%> (ø)	⬆️
addons/info/src/components/Story.js	88.03% <0%> (ø)	⬆️
addons/storyshots/src/react/renderShallowTree.js	57.14% <0%> (ø)	⬆️
addons/events/src/components/Event.js	38.55% <0%> (ø)	⬆️
lib/core/src/client/manager/provider.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/shortcuts_help.js	12.85% <0%> (ø)	⬆️
addons/storyshots/src/vue/renderTree.js	60% <0%> (ø)	⬆️
... and 69 more

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