I was thinking the same thing as you.
My idea was to use Google Sheets to compile an easy to use directory of information taken straight from the manual and put into a practical demonstration.
Obviously this is just a very rough draft, using the points you outlined above. It will need to be further organized and expanded upon, to cover all the bases.
https://docs.google.com/spreadsheets...it?usp=sharing
You will need to save a copy for yourself to modify it for now, but the nice thing about google sheets is it allows the sharing of a single copy which can be modified by multiple people so that everyone else can see the most recent version as more tutorials are created, or opt to add more content themselves!
For the tutorials, Google Slides has similar sharing and collaboration features and works much like Microsoft PowerPoint. I created a 2 slide example and linked it in the spread sheet directory.
Example of Google Slides:
https://docs.google.com/presentation...it?usp=sharing
PM me an email address I can send a collaborator link to. You can start adding stuff right away. I can help you get screenshots too.