Bump nuxt from 2.13.3 to 2.14.0 in /frontend

Sourced from nuxt's releases.

<h2>v2.14.0</h2> <h3>⭐ Highlights</h3>

• Static target improvements
• Auto detecting core-js version for project
• Official support for Nuxt.js with webstorm 2020.2
• New Guides section in documentation

<h3>🚀 Features</h3>

• webpack
  • #7785 Auto detect core-js version
• builder
  • #7754 Support async extendRoutes
• general
  • #7712 Static target improvements
• vue-renderer
  • #7633 Add vue-renderer:spa:prepareContext hook
• vue-app
  • #7611 Add web-types.json for better code insight in WebStorm

<h3>🐛 Bug Fixes</h3>

• webpack
  • #7787 ensure loaders are first searched from @nuxt/webpack
  • #7763 font-family hex issue
  • #7667 Fallback for empty chunk name
• vue-app
  • #7766 nuxt-link prefetch error on fallback page
  • #7718 Handle fallback on generated page
  • #7723 Don't fetch payload for store mutation for preview and spa fallback
• generator
  • #7776 Avoid duplicate slashes for routes ending with hash
• cli
  • #7775 Don't use absolute path of .cache/nuxt as transpilation pattern
• utils
  • #7761 Include routes with children for generation
• vue-renderer
  • #7752 Read target from class instead of serverContext
• router
  • #6594 Show default child if trailingSlash is false

<h3>🖤 Refactors</h3>

• server
  • 5272a4 Rename externalsWhitelist to externalsAllowlist

<h3>📝 Examples</h3>

• vuetify

• 60f6863 v2.14.0 [release]
• 1c8cc4c fix: add missing create-require dependency for webpack
• b51a4a9 fix: use core-js package.json to read version
• a575a87 chore(with-vuetify): fix lint issue
• aebf0ff fix(webpack): ensure loaders are first searched from @nuxt/webpack (#7787)
• 66b4aa2 fix(vue-app): nuxt-link prefetch error on fallback page (#7766)
• 6a2576b feat(webpack): auto detect core-js version (#7785)
• 5bbae31 chore(deps): update devdependency @nuxtjs/eslint-config to ^3.1.0 (#7788)
• 5f156d8 chore(deps): ignore css-loader update because of node compatibility
• 57773c9 chore(deps): lock file maintenance (#7782)
• Additional commits viewable in compare view

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