Matflow documentation ideas

[cjfullerton]

I've started this thread so we can collect together ideas for Matflow documentation.

The plan is to use the four level system described here: https://diataxis.fr/

When you post an idea, state whether you think it falls under:
-Tutorials
-How-tos
-Explanation
-Reference

Let's restrict this to MatFlow documentation only. Discussion thread for HPCFlow documentation is here: hpcflow/hpcflow#394