Workshop tutorials.

[rambaut]

I see these as stand alone beginning to end tutorials that we do in workshops. They are longer and more complete. They will tend not to reference other pages but include other information as 'boxes' or similar. However, it would be good to modularize these to avoid duplication and divergence with the online tutorials. Perhaps they could be constructed using the 'include' Jekyll feature and shared with online tutorials.

The expectation is the workshop tutorials get converted to PDF for inclusion in workshop materials.