Fixed references to storybook.js.org.

[Li0liQ]

Issue:

What I did

Updated references to storybook.js.org.

How to test

Follow the updated urls.

[codecov]

Codecov Report

Merging #1211 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1211   +/-   ##
=======================================
  Coverage   13.72%   13.72%           
=======================================
  Files         207      207           
  Lines        4611     4611           
  Branches      517      528   +11     
=======================================
  Hits          633      633           
+ Misses       3525     3515   -10     
- Partials      453      463   +10

Impacted Files	Coverage Δ
app/react/demo/src/stories/Welcome.js	0% <ø> (ø)	⬆️
app/react/addons.js	0% <ø> (ø)	⬆️
app/react-native/src/server/addons.js	0% <ø> (ø)	⬆️
lib/ui/src/modules/ui/containers/down_panel.js	23.52% <0%> (ø)	⬆️
addons/storyshots/src/storybook-channel-mock.js	0% <0%> (ø)	⬆️
...react-native/src/manager/components/PreviewHelp.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_routing.js	28.94% <0%> (ø)	⬆️
lib/ui/src/modules/api/configs/init_api.js	40.47% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/left_panel/header.js	27.58% <0%> (ø)	⬆️
addons/info/src/components/PropTable.js	0% <0%> (ø)	⬆️
... and 23 more

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[ndelangen]

Thank you @Li0liQ !!!