Add deprecation warnings when addons are required via main package

[shilman]

Issue: #1017

What I did

Use action and linkTo addons just like any other storybook addon.
Update examples, docs, and add deprecation warning to code.

How to test

First run:

npm run bootstrap
cd examples/cra-storybook
npm run storybook

Open browser console, and there should be no deprecation warnings.
Then, update the stories to use:

import { storiesOf, action, linkTo from } from '@kadira/storybook'

Deprecation warnings should appear in the browser console.

[codecov]

Codecov Report

Merging #1025 into master will decrease coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1025      +/-   ##
==========================================
- Coverage   12.56%   12.51%   -0.05%     
==========================================
  Files         196      196              
  Lines        4442     4458      +16     
  Branches      711      713       +2     
==========================================
  Hits          558      558              
- Misses       3255     3269      +14     
- Partials      629      631       +2

Impacted Files	Coverage Δ
packages/react-storybook/src/server/addons.js	0% <0%> (ø)	⬆️
packages/react-native-storybook/src/index.js	0% <0%> (ø)	⬆️
...ckages/react-native-storybook/src/server/addons.js	0% <0%> (ø)	⬆️
...ts/stories/required_with_context/Button.stories.js	0% <0%> (ø)	⬆️
packages/react-storybook/demo/src/stories/index.js	0% <0%> (ø)	⬆️
packages/addon-info/example/story.js	0% <0%> (ø)	⬆️
packages/react-storybook/src/client/index.js	0% <0%> (ø)	⬆️
...s/stories/required_with_context/Welcome.stories.js	0% <0%> (ø)	⬆️

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[ndelangen]

Is this missing addon-links?
Or is this on purpose?

[shilman]

on purpose. links are not used in this example.

[ndelangen]

This dangling underscore will become an eslint error in the future, can you pick another naming pattern?

[shilman]

fixed!

[nx-cloud]

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