Keep examples' deps up to date

[Hypnosphi]

Issue: When publishing, the @storybook/* packages' versions don't get updated in examples. The reason is ignore section in lerna.json. Actually, it's safe to remove this section, because the examle packages are marked as private and won't get published anyway

[codecov]

Codecov Report

Merging #2353 into master will decrease coverage by 0.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2353      +/-   ##
==========================================
- Coverage   21.38%   21.23%   -0.15%     
==========================================
  Files         283      283              
  Lines        6182     6155      -27     
  Branches      863      725     -138     
==========================================
- Hits         1322     1307      -15     
- Misses       4223     4297      +74     
+ Partials      637      551      -86

Impacted Files	Coverage Δ
app/vue/src/server/utils.js	0% <0%> (-44.12%)	⬇️
lib/ui/src/modules/api/configs/init_api.js	40.47% <0%> (ø)	⬆️
...res__/update-addon-info/update-addon-info.input.js	0% <0%> (ø)	⬆️
addons/knobs/src/KnobStore.js	9.09% <0%> (ø)	⬆️
addons/knobs/src/components/types/Color.js	8.21% <0%> (ø)	⬆️
addons/knobs/src/components/types/Number.js	8.06% <0%> (ø)	⬆️
addons/knobs/src/components/types/Object.js	5.88% <0%> (ø)	⬆️
addons/info/src/components/markdown/htags.js	30% <0%> (ø)	⬆️
addons/a11y/src/components/Tabs.js	0% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/layout/dimensions.js	15.62% <0%> (ø)	⬆️
... and 26 more

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