git authentication

[hansvancalster]

I've written a tutorial about Git Authentication, which is in review inbo/tutorials#309.
It probably makes sense to move parts of this tutorial to this repository (alternatively, we can refer to the tutorial from this git-course website).

I propose to contribute to https://inbo.github.io/git-course/course_rstudio.html in the setup section and the store your password section.
The current course material is out of date given the recent changes (as of 2021-08-13) in GitHub requiring a personal access token for remote git operations over HTTPS protocol. I also think these changes imply that the git authentication stuff is taught at the very beginning of the course.

I will also adapt the writing style so it conforms to the style of the workshop and condense the material.

There are still some open / debated issues in that tutorial that need to be agreed upon before I can proceed.

[florisvdh]

It probably makes sense to move parts of this tutorial to this repository (alternatively, we can refer to the tutorial from this git-course website).

@hansvancalster since the tutorial was merged in June, this can be taken up I suppose?