hugo extended version + nodejs

[balopat]

Required for the new site's theme, docsy - we need extended version with postcss-cli npm module and hence nodejs in the docs controller image.

[codecov-io]

Codecov Report

Merging #1295 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1295   +/-   ##
=======================================
  Coverage   44.24%   44.24%           
=======================================
  Files         104      104           
  Lines        4629     4629           
=======================================
  Hits         2048     2048           
  Misses       2372     2372           
  Partials      209      209

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