Advanced Controls Simulations - Mouseover Interactivity Cues

[gerth2]

Once https://github.com/wpilibsuite/frc-docs/pull/1821 is merged...

Add some visual cues to show people they're supposed to click on the simulation to change where the setpoint is. I can think of a number of reasonable ways to do it.... perhaps something like:

• Add light yellow highlights around where a user should be clicking. On mouseover, make these visible for some time, then fade out on mouse leave?

Lots of options though.