Adjust nodejs install method
We are using the nodejs setup_X script to install it, but the recommended method is now to use the package manager.
#16 0.335 SCRIPT DEPRECATION WARNING
#16 0.335
#16 0.335
#16 0.335 This script, located at https://deb.nodesource.com/setup_X, used to
#16 0.335 install Node.js is deprecated now and will eventually be made inactive.