Restructure this guide to be organised for intended audience, rather topics/style of content

Currently, this guide has a somewhat awkward content structure IMO. As it stands, I believe it is difficult to find answers to the specific questions you might care about, unless you know exactly what you're looking for.

One of the ways that we can improve this would be to pivot the guide away from organising content as "tutorials" / "guides" etc, and more toward separating content on the basis of the audience that would want to read it. A potential split of audiences based on "what you might be interested in" would be:

• "consumer": Using Python packages
• "author": Author/maintainer of Python software (that likely also uses Python packages)
• "tooling-author": Author/maintainer of a tool that interacts with Python packages / index etc.
• "contributor" : People who wish to contribute to this guide, specifically.

Start by reviewing the guide's current content structure and navigation, then compare it with the proposed consumer, author, tooling-author, and contributor audiences. Done means the guide is reorganized around those audiences so readers can find answers based on what they want to do.