Add correct links to tutorials in the README file

[JenniferRoelens]

Task Description

Adding the correct links to the tutorials in the README file would help new users :).

[sandervh14]

May have been solved by dev branch commit that was unmerged to master until today: 13802c9. To be checked.

[joostneuj]

Hey Sander,

Double checked this and the link to the tutorials in the readme section is working fine now. So I think we can close this issue?