Add Previews of deployed examples via Netlify

[cheapsteak]

Issue:

What I did

Added config and build scripts for Netlify to support deploy previews

How to test

https://deploy-preview-2304--tax-collector-david-22676.netlify.com/

https://deploy-preview-2304--tax-collector-david-22676.netlify.com/cra-kitchen-sink

https://deploy-preview-2304--tax-collector-david-22676.netlify.com/vue-kitchen-sink

[codecov]

Codecov Report

Merging #2304 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2304   +/-   ##
=======================================
  Coverage   21.19%   21.19%           
=======================================
  Files         283      283           
  Lines        6156     6156           
  Branches      728      722    -6     
=======================================
  Hits         1305     1305           
- Misses       4303     4315   +12     
+ Partials      548      536   -12

Impacted Files	Coverage Δ
app/react/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/babel_config.js	0% <0%> (-77.42%)	⬇️
addons/knobs/src/components/types/Number.js	8.06% <0%> (ø)	⬆️
addons/a11y/src/components/Tabs.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/layout.js	12.5% <0%> (ø)	⬆️
addons/info/src/components/markdown/htags.js	30% <0%> (ø)	⬆️
.../src/manager/containers/CommentsPanel/dataStore.js	34.04% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/layout/dimensions.js	15.62% <0%> (ø)	⬆️
addons/knobs/src/components/PropField.js	10.63% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-start.js	0% <0%> (ø)	⬆️
... and 21 more

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[danielduan]

that's awesome, thanks!