Side menu expands before page reload

[stefanv]

I'm browsing https://book.the-turing-way.org

I notice that, when clicking on a side-menu section, that section expands and then the page reloads. This is quite jarring! If a page reload is going to happen, that should probably happen immediately?

A more fluid experience would be to have the menu expand (as it currently does), followed by a refresh of only the content panel.