Added coursera demo to docs

[shilman]

Issue: N/A

What I did

• link on featured users
• thumbnail/link on examples page

How to test

cd docs
yarn install && yarn dev
open http://localhost:8000
open http://localhost:8000/examples

[codecov]

Codecov Report

Merging #1217 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1217   +/-   ##
======================================
  Coverage    13.7%   13.7%           
======================================
  Files         207     207           
  Lines        4647    4647           
  Branches      510     593   +83     
======================================
  Hits          637     637           
+ Misses       3570    3498   -72     
- Partials      440     512   +72

Impacted Files	Coverage Δ
lib/ui/src/modules/ui/configs/init_panels.js	25% <0%> (ø)	⬆️
app/react/src/client/preview/render.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/types/Boolean.js	11.62% <0%> (ø)	⬆️
addons/events/src/components/Event.js	0% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-build.js	0% <0%> (ø)	⬆️
addons/info/src/components/PropTable.js	0% <0%> (ø)	⬆️
addons/storyshots/src/test-bodies.js	0% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/left_panel/header.js	27.58% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/left_panel.js	20% <0%> (ø)	⬆️
app/react/src/client/preview/reducer.js	0% <0%> (ø)	⬆️
... and 21 more

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[shilman]

Self-merging if I don't hear back soon since it's a trivial change 👿

[xavxyz]

Trivial change, but so great! ❤️

Dope storybook!