Update gatsby-source-filesystem in /docs from 1.5.27 to 1.5.28

[ghost]

Dependencies.io has updated gatsby-source-filesystem (a npm dependency in /docs) from "1.5.27" to "1.5.28".

1.5.28

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[codecov]

Codecov Report

Merging #3349 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3349   +/-   ##
=======================================
  Coverage   36.84%   36.84%           
=======================================
  Files         458      458           
  Lines       10028    10028           
  Branches      885      900   +15     
=======================================
  Hits         3695     3695           
+ Misses       5798     5778   -20     
- Partials      535      555   +20

Impacted Files	Coverage Δ
lib/core/src/server/build-dev.js	20% <0%> (ø)	⬆️
.../src/modules/ui/components/stories_panel/header.js	28.57% <0%> (ø)	⬆️
addons/info/src/components/types/Shape.js	66.03% <0%> (ø)	⬆️
lib/ui/src/libs/key_events.js	33.96% <0%> (ø)	⬆️
addons/knobs/src/components/types/Files.js	14.28% <0%> (ø)	⬆️
addons/knobs/src/components/types/Color.js	8.1% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/layout/dimensions.js	22.58% <0%> (ø)	⬆️
addons/graphql/src/components/FullScreen/index.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/layout/index.js	28.18% <0%> (ø)	⬆️
...es__/update-addon-info/update-addon-info.output.js	0% <0%> (ø)	⬆️
... and 66 more

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