Move the FD2School materials out of the main Repo

[braughtg]

Currently the FD2School materials are in the farmdata2/farmdata2_modules/fd2_school module. It would be better if these were in a separate repository.

We would want to:

• Include instructions or a script that will bring them into the FarmData2 repo for new developers and/or class use.

We would need to:

• Consider carefully how this affects the use of these materials in a class. In particular, if a student were to run the above script then all of the fd2_school module stuff will become part of their repo and thus be part of the PR's that they create for the activity. Thiis would generally be okay, but we would want to be sure that the activities themselves are added to the .gitignore for the main repo so that they are not a part of every student PR for the activites.