Add an option to hide the mouse cursor

[normanr]

It would be nice to have a URL variable to hide the mouse pointer by adding cursor: none to the body style.

[SidVal]

Great suggestion! @normanr I've added support for hiding the cursor via the URL parameter ?hideCursor=true.
Currently testing it here: https://sidval.github.io/matrix/?hideCursor=true

PS, @Rezmason If you think it's a worthy addition and it helps reduce your maintenance workload, I'm happy to submit a PR — just let me know.