readme: added pages pointer

README.md

@@ -33,7 +33,10 @@ docker run --rm -it -p 8888:8888 gitlab.liu.se:5000/phd-courses/multiple-target-
 
 # Documentation
 The documentation is hosted on Gitlab pages but is also buildable locally in the provided Docker image.
-To build the documentation the following procedure is suggested.
+The documentation can be found [here](https://phd-courses.gitlab-pages.liu.se/multiple-target-tracking).
+
+#### Building the documentation locally
+To build the documentation the following procedure is suggested. It is assumed that the Docker image has been built already. Otherwise, substitute `targettracking` with `gitlab.liu.se:5000/phd-courses/multiple-target-tracking` below.
 ```
 docker run --rm -it -v "$(pwd)":/home/jovyan/work targettracking pdoc --html --output-dir work/html/ src/
 ```