Update Ebola practicals part 1

[thibautjombart]

Some of the packages used in the Ebola practicals part 1 and 2 have changed. It would be good to recompile these practicals, and maybe update a couple of practices illustrated in them. This issue concerns part 1 only.

Links

• part 1:
  https://www.reconlearn.org/post/simulated-evd-early.html

• part 2, though not for this issue):
  https://www.reconlearn.org/post/practical-ebola-reconstruction.html

I will PR changes in the coming days.