[slides] Link to slide overview in main readme

README.md

@@ -5,7 +5,7 @@
 The material is organized as follows
 
 * __Exercises__: click [here](./exercises/README.md) to go to the exercise description
-* __Slides__: click [here](https://pages.iws.uni-stuttgart.de/dumux-repositories/dumux-course/index#/title-slide) to view the slides
+* __Slides__: click [here](./slides/README.md) to view the slide overview
 * __Links__: click [here](./links/README.md) to go to a list of useful links
 
 ## Installation of the course
@@ -17,8 +17,8 @@ If you plan to use Ubuntu on Windows via WSL, we have a brief [installation docu
 
 ### Install DuMu<sup>x</sup> together with the course
 
-The easiest way to install everything you need is to use the install script `installcourse.sh`. 
-The script will install all needed ubuntu-packages, clone the required git repositories and build the dumux-course. 
+The easiest way to install everything you need is to use the install script `installcourse.sh`.
+The script will install all needed ubuntu-packages, clone the required git repositories and build the dumux-course.
 
 It is also recommended to have a look inside the script, for further understanding.