Update tutorials and improve second half of the semester

Tutorials 6 - 12 should be improved, some can be merged and substituted by Elm (#23) as another way of functional programming - frontend oriented. It may require also a change in tutorials 3, 4, and 5.

Plan

[x] Tutorial 1 - just go through and update
[x] Tutorial 2 - just go through and update
[x] Tutorial 3 - text types (as evaluation is already there)
[x] Tutorial 4 - more information about advanced function
[x] Tutorial 5 - basic typeclasses and also start of IO monad, error handling
[x] Tutorial 6 - also performance, profiling and debugging
[x] Tutorial 7 - advanced typeclasses and transformers
[x] Tutorial 8 - webapp
[x] Tutorials 9, 10, 11 - Elm #23 (12 can be partly Elm - "follow ups and interesting FP stuff")

MI-AFP / tutorials

Update tutorials and improve second half of the semester #25

Plan