Add support for Vue projects using Nuxt

[marshallswain]

This adds detection for projects using Nuxt: https://nuxtjs.org/

[codecov]

Codecov Report

Merging #1794 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1794   +/-   ##
=======================================
  Coverage   21.14%   21.14%           
=======================================
  Files         252      252           
  Lines        5693     5693           
  Branches      688      691    +3     
=======================================
  Hits         1204     1204           
+ Misses       3969     3965    -4     
- Partials      520      524    +4

Impacted Files	Coverage Δ
lib/cli/lib/detect.js	0% <ø> (ø)	⬆️
app/react-native/src/preview/story_kind.js	0% <0%> (ø)	⬆️
...react-native/src/manager/components/PreviewHelp.js	0% <0%> (ø)	⬆️
addons/info/src/components/Props.js	37.2% <0%> (ø)	⬆️
app/react/src/client/preview/error_display.js	0% <0%> (ø)	⬆️
...es__/update-addon-info/update-addon-info.output.js	0% <0%> (ø)	⬆️
...s/left_panel/stories_tree/tree_decorators_utils.js	45.23% <0%> (ø)	⬆️
...res__/update-addon-info/update-addon-info.input.js	0% <0%> (ø)	⬆️
lib/ui/src/libs/key_events.js	23.25% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/layout/dimensions.js	15.62% <0%> (ø)	⬆️
... and 16 more

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