This task documents the following user stories: RHODS-163, RHODS-154, RHODS-147

However, since the "define server environment" part of this is covered by RHODS-427 and RHODS-425 this really only needs to cover how to define and install dependencies in notebooks, e.g.

• updating requirements.txt for your application (part of RHODS-432)
• installing packages on your notebook server using the JupyterHub terminal or notebook cell (covered in how-to material: https://access.redhat.com/documentation/en-us/red_hat_openshift_data_science/1/html-single/how_to_install_python_packages_on_your_notebook_server/index )