Add Installation in Preamble section

[ahuang11]

Many docs pages include an installation section on the left column.

When I first browsed the cookbooks, I had trouble figuring out how to run the notebook with all the requirements. It turns out it was on the homepage:
https://projectpythia.org/dask-cookbook/README.html#running-on-your-own-machine

Ideally, this would be migrated, or linked, to the left column

[brian-rose]

I think this is a great suggestion that nobody has followed through on. It makes a lot of sense to me to have a "How to run" page listed in the left nav-bar along with the "How to cite" page.