Finishing up

We have now modularized and tested the code for the Create User feature. Therefore, now is a good time to merge our current create-user/refactor-modules branch into the create-user/main branch. Since this also completes the Create User feature, we should merge the create-user/main feature branch back into the dev branch:

$ git checkout create-user/main
$ git merge --no-ff create-user/refactor-modules
$ git checkout dev
$ git merge --no-ff create-user/main