This fixes running ipython console and ipython3 console, as the
jupyter_console package is missing.
As python-ipython is an input to python-jupyter-console, use a modified
version of the package which doesn't have this input.
* gnu/packages/python.scm (python-jupyter-console-minimal): New variable.
(python-ipython)[propagated-inputs]: Replace python-jupyter-console with
python-jupyter-console-minimal.