fix(types): add nuxt.config alias type

[iamandrewluca]

https://nuxtjs.org/docs/2.x/directory-structure/nuxt-config#alias

[codecov-commenter]

Codecov Report

Merging #9424 (de528c0) into dev (af98868) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #9424   +/-   ##
=======================================
  Coverage   65.15%   65.15%           
=======================================
  Files          94       94           
  Lines        4107     4107           
  Branches     1125     1125           
=======================================
  Hits         2676     2676           
  Misses       1153     1153           
  Partials      278      278           

Flag	Coverage Δ
unittests	65.15% <ø> (ø)

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[danielroe]

Thank you! ❤️