I want to make it look similar to here (just our old website we moved away from and which we are not using anymore)
http://essence-of-horhsal.boards.net/page/worldbuilding or more specifically like on the left. Just have a navigation with collapsable function. Of course, it shouldn't look as ugly as the example (like, without the way too big collapse buttons). It should also be possible that you can click on a name and it will link you to the page while there is a little button next to the name to collapse beneath it so that a word could act as category and link as the same time. I hope it is understandable what I mean.
Which plugin would be the best to achieve something like that?
Edit: I found something myself, so this can be erased/closed.