Tut classpath issues when upgrading to Monix 3.1.0

[DavidGregory084]

Due to the way that the TutModule works in mill ( my fault 😅 ) it's possible for multiple incompatible versions of the Scala libraries to end up on the the Tut classpath

This produces some weird and whacky results when trying to run Tut.

Rather than fixing the TutModule it might be a good idea to investigate mdoc now that Tut is deprecated.

[DavidGregory084]

Wrapping mdoc should be straighforward, it can simply run as an external java process like tut via its main method.