Make a library of figure tutorials

[widdowquinn]

@mafeeney had the idea to make a library of example WebR pages for things like plotting on a log scale, etc. to support data visualisation across the years. This is a Good Idea™️™️ and we should do it.

[mafeeney]

Initialised StudentResources as a hopefully-convenient place for such resources to live: https://github.com/sipbs-compbiol/StudentResources.