Uplift the nodejs install in the server Dockerfile

[vodorok]

When building the docker image, the following warning message appears:

================================================================================

                       SCRIPT DEPRECATION WARNING                    

This script, located at https://deb.nodesource.com/setup_X, used to
install Node.js is deprecated now and will eventually be made inactive.

Please visit the NodeSource distributions Github and follow the
instructions to migrate your repo.
https://github.com/nodesource/distributions

The NodeSource Node.js Linux distributions GitHub repository contains
information about which versions of Node.js and which Linux distributions
are supported and how to install it.
https://github.com/nodesource/distributions

                      SCRIPT DEPRECATION WARNING

================================================================================

TO AVOID THIS WAIT MIGRATE THE SCRIPT
Continuing in 60 seconds (press Ctrl-C to abort) ...

Installing the NodeSource Node.js 16.x repo...

As per instructions in the warning message, the nodejs installation method should be uplifted.