adding kernels vs. starting the notebook from within an environment.

[ljwolf]

Users were occasionally confused about which kernels were active and how they were active.

We were working with users who were likely to have more than one environment installed, since they were attending more than one workshop.

We should be consistent in our installation directions to either install nb_conda_kernelsinto our environment from conda forge, which provides the user with a better kernel browser and adds the install environment to the browser, or be clear that we expect the user to start jupyter notebook from within the environment.

I prefer the kernel browser in UI rather than in the terminal, so I would prefer using nb_conda_kernels.