Co-authored-by: Jan Frenzel <jan.frenzel@tu-dresden.de>

Co-authored-by: Jan Frenzel <jan.frenzel@tu-dresden.de>

- Merge functionality of two check links scripts into one
- Document usage of the script when working with docker container

All `Python` modules now export `PIP_REQUIRE_VIRTUALENV=true`.
This causes an error when users try to use `pip install` without an
active virtualenv.
This also avoids admins accidentally installing/changing Python packages
in the global module.

- Fix prompt: module spider can and should be invoked on login node

This process is very well documented at ZIH's webpage.