felher
Add Scastie integration
It should be able to integrate s3te into scastie, so that one can just open scastie and browse the scala code there without having to install anything.
Okay, because of https://github.com/scalacenter/scastie/pull/1054, it seems that scala 3 libraries don't currently work on scalajs. So this will be a larger-than-expected refactoring, splitting the code into different modules and dropping scala3 features from the modules that need to work in scastie.
After rewriting to use only scala 2 features and using scalajs-dom with for3Use2_13, there still seem to be some problems, currently tracked by https://github.com/scalacenter/scastie/issues/1102