Improve TUF onboarding for new users

[trishankatdatadog]

Description of issue or feature request:

We need a much easier to understand, coding-first, reading-later introduction to TUF.

Current behavior:

Following up on our PEP 458 WG meeting today, people who are new to TUF find it too difficult to read all of the academic papers and specification before ramping up with working code.

Expected behavior:

There are many options here. One is to have a friendly, interactive website that quickly introduces programmers w/o security backgrounds to the problem, and how to use python-tuf to solve most use cases w/o thinking too much about it.

Cc @joshuagl and his colleagues

[lukpueh]

Highly related:

• Documentation Overhaul #808 tracks ongoing efforts and ideas for overhauling and consolidating the existing documentation
• Roadmap for cli tools: repo.py, client.py #881 discusses the future of the repo and client cli tools, which some have said are useful for learning python-tuf. It also lists a few related issues

Btw. I have doubts that this is a "good first issue". The task requires deep knowledge about TUF and python-tuf. Do you mind if I remove the label?

[trishankatdatadog]

Nope, go for it!

[lukpueh]

#1797 seems like a duplicate but with more up-to-date references. Closing here...