Building the target installs node packages, imports from Contentful and
builds the site via gulp and hugo.

Lars Bilke authored 8 years ago and Dmitry Yu. Naumov committed 8 years ago

Fixes #1266.

- Works on Mac
- Needs to be checked on Linux / Windows.

Beforehand this logic was executed in a forced addional CMake run
everytime after the specific executable was built. Now this is done
at the moment this information is needed (at building the package or
install target).

copied from OGS5