links should navigate in the parent window

[blairanderson]

Issue:

fixes #1122

What I did

I found that creating normal <a target="_blank" href="https://www.google.com">foo</a> links inside of a story would update the iframe and not actually take the user out to the external link

<base>tag is supported by all browsers https://stackoverflow.com/a/2656798/1536309

How to test

before:
add a link to a component and click on it.
<a href="https://www.google.com">google</a>
will only update the iframe

after:
link moves on the parent window.

[blairanderson]

fyi users can temporarily fix with using their own head tags:

https://storybook.js.org/configurations/add-custom-head-tags/

[Hypnosphi]

Good fix! Please update it in app/vue as well

[codecov]

Codecov Report

Merging #1650 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1650   +/-   ##
=======================================
  Coverage   21.14%   21.14%           
=======================================
  Files         247      247           
  Lines        5575     5575           
  Branches      675      663   -12     
=======================================
  Hits         1179     1179           
- Misses       3890     3907   +17     
+ Partials      506      489   -17

Impacted Files	Coverage Δ
app/react/src/server/iframe.html.js	63.15% <ø> (ø)	⬆️
lib/ui/src/modules/api/configs/init_api.js	40.47% <0%> (ø)	⬆️
addons/knobs/src/components/PropForm.js	8.51% <0%> (ø)	⬆️
addons/notes/src/react.js	0% <0%> (ø)	⬆️
lib/codemod/src/transforms/update-addon-info.js	53.65% <0%> (ø)	⬆️
...ponents/left_panel/stories_tree/tree_decorators.js	32.98% <0%> (ø)	⬆️
lib/ui/src/modules/shortcuts/actions/shortcuts.js	6.25% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/layout/usplit.js	38.7% <0%> (ø)	⬆️
lib/ui/src/modules/api/actions/api.js	50.47% <0%> (ø)	⬆️
...react-native/src/manager/components/PreviewHelp.js	0% <0%> (ø)	⬆️
... and 17 more

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[danielduan]

If you can update app/vue, think we're good to merge. Thanks for fixing!

[blairanderson]

@danielduan I updated app/vue file as well 👍