Fix links in repo outline

And use relative ones to make it portable

README.md

 This repository will be used as the website for Functional Programming CS-210. It will be updated weekly throughout the semester. This README contains general information about the class.
 
-- [previous-years-exams](https://gitlab.epfl.ch/lamp/cs210-material/week1/tree/master/previous-years-exams) contains PDFs for the 2016, 2017 and 2018 exams.
-- [recitation-sessions](https://gitlab.epfl.ch/lamp/cs210-material/week1/tree/master/recitation-sessions) contains markdown documents for recitation sessions and solutions.
-- [slides](https://gitlab.epfl.ch/lamp/cs210-material/week1/tree/master/slides
-) contains the slides presented in class.
+- [previous-years-exams](previous-years-exams) contains PDFs for the 2016, 2017 and 2018 exams.
+- [recitation-sessions](recitation-sessions) contains markdown documents for recitation sessions and solutions.
+- [slides](slides) contains the slides presented in class.
 
-We will use GitLab's issue tracker as a discussion forum. Feel free to [open an issue](https://gitlab.epfl.ch/lamp/cs-210-functional-programming-2019/issues/new) if you have any comments or questions.
+We will use GitLab's issue tracker as a discussion forum. Feel free to [open an issue](../issues/new) if you have any comments or questions.
 
 # IMPORTANT: First week tasks