Docs: Add missing NPM script section to Vue guide

[JanCVanB]

It seems that this necessary setup step didn't get copy-pasted over from the React guide (probably because it isn't a standalone section in the React guide).

[codecov]

Codecov Report

Merging #1824 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1824   +/-   ##
=======================================
  Coverage   21.32%   21.32%           
=======================================
  Files         257      257           
  Lines        5739     5739           
  Branches      687      689    +2     
=======================================
  Hits         1224     1224           
+ Misses       3995     3986    -9     
- Partials      520      529    +9

Impacted Files	Coverage Δ
app/vue/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/vue/src/server/babel_config.js	0% <0%> (-77.42%)	⬇️
addons/knobs/src/components/PropForm.js	8.51% <0%> (ø)	⬆️
addons/info/src/components/markdown/code.js	24.13% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/layout/dimensions.js	15.62% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/hierarchy.js	48.8% <0%> (ø)	⬆️
...res__/update-addon-info/update-addon-info.input.js	0% <0%> (ø)	⬆️
addons/info/src/components/Props.js	36.36% <0%> (ø)	⬆️
...codemod/src/transforms/update-organisation-name.js	40.62% <0%> (ø)	⬆️
app/react/src/client/preview/error_display.js	0% <0%> (ø)	⬆️
... and 18 more

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[ndelangen]

Thank you very much @JanCVanB ! I will deploy a new docs version now!

[ndelangen]

Deployed!

https://storybook.js.org/basics/guide-vue/#create-the-npm-script

[JanCVanB]

Thanks @ndelangen!