Nav-Expand/Collapse also enters chapter

[Zabuzard]

Clicking on the expand/collapse button > in the navigation will also enter the chapter. This is confusing and should be changed to only expand/collapse the chapter but not change sites.

This is due to js/extra.js line 12 spawning a click event when clicking anywhere on $("li.chapter-item"). This is done to allow users to not only click on the text/name of a chapter but also on the empty room next to it.

Essentially, what we want is that the first 2 of the following areas will enter a chapter, but the last area not:

Bit tricky though, given that the underlying HTML structure doesnt really expose such a structure but instead has the expand/collapse button contained in the empty area:

[Zabuzard]

The code has been temporarily commented out until this is fixed properly.