Make sure Git course works on Linux and Git Bash terminal

[AnnikaLau]

[mjaehn]

For the beginners course, this is actually done with 0c79496

For advanced, I am not sure it can be done in Git Bash

[AnnikaLau]

For the beginners course, this is actually done with 0c79496

For advanced, I am not sure it can be done in Git Bash

It should anyway be done as a check before every course.

[AnnikaLau]

Test helpers function and check requirements.

[mjaehn]

If they manage to set up python within git bash, everything should work.

[AnnikaLau]

We can remove the beginner label once #157 is merged