CRA Example Cleanup - Info

[danielduan]

Issue:

#1750

What I did

• cleaned up info examples and added new examples for different options
• turned on automatic import for *.stories.js so future stories could be separated easily
• will cleanup existing info usages and move old examples to a deprecated kind later

How to test

Is this testable with jest or storyshots?
yes

Does this need a new example in the kitchen sink apps?
this is it

Does this need an update to the documentation?
no

If your answer is yes to any of these, please make sure to include it in your PR.

[codecov]

Codecov Report

Merging #2143 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #2143   +/-   ##
======================================
  Coverage    21.4%   21.4%           
======================================
  Files         263     263           
  Lines        5812    5812           
  Branches      694     706   +12     
======================================
  Hits         1244    1244           
+ Misses       4041    3996   -45     
- Partials      527     572   +45

Impacted Files	Coverage Δ
app/react/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/babel_config.js	0% <0%> (-77.42%)	⬇️
...react-native/src/manager/components/PreviewHelp.js	0% <0%> (ø)	⬆️
addons/events/src/components/Event.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/types/Number.js	8.06% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/menu_item.js	19.14% <0%> (ø)	⬆️
addons/storyshots/src/require_context.js	0% <0%> (ø)	⬆️
app/react/src/client/preview/element_check.js	41.17% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/down_panel.js	23.52% <0%> (ø)	⬆️
addons/knobs/src/components/PropForm.js	9.09% <0%> (ø)	⬆️
... and 18 more

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