[STORYSOURCE] Add ability to select stories from inside of the StoryPanel

[igor-dv]

What I did

I've added the navigation from within the addon-storysource panel.

Since it's still in alpha, I'm not sure whether this is a feature request or not.

[codecov]

Codecov Report

Merging #3154 into master will decrease coverage by 0.12%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #3154      +/-   ##
==========================================
- Coverage   36.16%   36.03%   -0.13%     
==========================================
  Files         437      437              
  Lines        9430     9464      +34     
  Branches      870      905      +35     
==========================================
  Hits         3410     3410              
- Misses       5475     5480       +5     
- Partials      545      574      +29

Impacted Files	Coverage Δ
addons/storysource/src/preview.js	0% <ø> (ø)	⬆️
addons/storysource/src/StoryPanel.js	0% <0%> (ø)	⬆️
addons/storysource/src/manager.js	0% <0%> (ø)	⬆️
app/polymer/src/server/utils.js	0% <0%> (-100%)	⬇️
addons/jest/src/components/Result.js	0% <0%> (ø)	⬆️
addons/a11y/src/components/Report/Elements.js	0% <0%> (ø)	⬆️
app/react/src/client/preview/element_check.js	67.64% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_routing.js	24.21% <0%> (ø)	⬆️
addons/actions/src/lib/types/symbol/index.js	81.25% <0%> (ø)	⬆️
addons/a11y/src/components/Report/Item.js	0% <0%> (ø)	⬆️
... and 58 more

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[Hypnosphi]

why not just use button tag?

[igor-dv]

I think it's semantically more like an anchor than a button so maybe a ?

[igor-dv]

Just checked and resetting a button to look like a div - is hell...

[Hypnosphi]

I'd say that making div behave as a button is hell =)

I think it's semantically more like an anchor than a button so maybe a?

Cool idea as soon as you attach a valid href. You may want to use RoutedLink component from @storybook/components to avoid page reload on plain left clicks