Move exercise solutions to episodes

[tobyhodges]

Hi @datacarpentry/python-ecology-lesson-es-maintainers, today I finished migrating the solutions to challenges into the relevant episodes of the English version of this lesson. While I was working on it, I updated and expanded several of them, and I also moved some of the Instructor Notes inline as well.

I'm sorry to say that I lack the Spanish language skills to do the same for your lesson. But perhaps you would like to coordinate migration/translation of the challenge solutions in this Spanish version as well?

cc @Czirion