Add tutorials

[gilesknap]

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[gilesknap]

@ggayDiamond I've run out of time but have the majority of the first two tutorials in place.

I've also merged a reasonably decent update to the remaining documentation.

Please give these a try. The best way to read them is from inside the devcontainer:-

• git checkout tutorials
• tox -e docs-autobuild
• click on the URL link that appears

I'm off to London to meet some old Microsoft friends that I see about once every 8 years or so.
laters.