rm code for showing our one & only hint: the intersecttool hint

PROBLEM
=========
We show a hint card for a single tool, i.e. the intersecttool. This is inconsistent with respect to the other selectable tools, for which currently no hints exist (or any plans to implement them in the foreseeable future). This single hint will confuse users, since they'll expect hints for the other selectable tools.

SOLUTION
=========
Hunt the hint and kill it with fire.