chore: upgrade to vue cli 4

[fdlk]

Upgrades the boilerplate to vue cli 4 Cleans up a lot of dependency mess but I do still get errors from ts-jest, unsure how to fix those

Checklist

• [ ] Functionality works & meets specifications
• [ ] Code reviewed
• [ ] Code unit/integration/system tested
• [ ] User documentation updated
• [ ] Clean commits
• [ ] No warnings during install
• [ ] Added Feature/Fix to release notes

[codecov[bot]]

Codecov Report

Merging #123 (6bce843) into master (39fed2b) will increase coverage by 0.0%. The diff coverage is 100.0%.

@@          Coverage Diff           @@
##           master    #123   +/-   ##
======================================
  Coverage    93.0%   93.1%           
======================================
  Files          18      17    -1     
  Lines         144     145    +1     
  Branches       20      18    -2     
======================================
+ Hits          134     135    +1     
  Misses         10      10           

Flag	Coverage Δ
unit	93.1% <100.0%> (+<0.1%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/components/FooterComponent.vue	100.0% <ø> (ø)
src/components/HeaderComponent.vue	100.0% <ø> (ø)
src/exampleMenu.ts	100.0% <ø> (ø)
tests/unit/fixtures/context.ts	100.0% <ø> (ø)
src/components/NavBar.vue	81.2% <100.0%> (-0.9%)	:arrow_down:
src/service/CookieService.ts	100.0% <100.0%> (ø)
src/store/getters.ts	100.0% <100.0%> (ø)
src/service/LanguageService.ts	100.0% <0.0%> (ø)
src/components/PageComponent.vue	100.0% <0.0%> (ø)
... and 1 more

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