Miniforge install instructions for Python don't install jupyterlab, which is required for the python lesson

As @sstevens2 pointed out in https://github.com/swcarpentry/python-novice-gapminder/issues/719 , Anaconda is no longer used for teaching python.

The Python lesson uses Jupyter Lab so if we're not getting this from Anaconda I think it needs to be installed with conda-forge.

Perhaps this is my lack of understanding but I followed the install instructions for python: https://carpentries.github.io/workshop-template/install_instructions/#python and then expected to be able to use Jupyter Labs. This wasn't sufficient. I also needed

`conda install -c conda-forge jupyterlab`.

Either I missed something or this should be added to the python install instructions.

Start with the Python section of the linked workshop-template install instructions and compare the documented Miniforge setup with the Python lesson's Jupyter Lab requirement. Verify the instructions in a fresh environment; done means following them installs everything needed to launch Jupyter Lab without an extra manual conda command.

Written by the indexing model from the issue text.