please add section to tutorial for switching over to and using postgres

[Becka R.]

Because it is not possible to deploy Django with SQLite, the tutorial would be much more complete with a section for "beyond the basics."

I now have a solid understanding of the fundamentals, and have been struggling a lot to level up, and there are a lot of common use cases which are insufficiently documented.

In a "beyond the basics" tutorial section, one chapter might include step by step instructions for moving over to Postgres using Psycopg2, and then using multiple settings files depending on the dev context, and understanding how to navigate this (honestly, I'm not even sure what questions to ask here, because I barely understand how it works).

It's very, very easy to make mistakes here, and the documentation for the psycopg2 package itself is inaccurate, and the docs for Postgres are overwhelming. The combination of Django and Postgres to the new dev feels very, very insurmountable without a pairing buddy. Please add docs to add support for this very standard and confusing process.