Fixed the missing WMR control scheme page which was completely blank (it should have at least showed the vive controls)

I also drew up a schematic for the WMR control mapping.  I still have other artwork to update but it should be okay for now. I just wanted to do a thorough test of the WMR controls.

It just occurred to me that I still have to look into support for the many different headsets because there are so many and they aren't clearly flagged as WMR in the XR API, but instead are categorized by the manufacturer, i.e. Samsung, Acer, etc... Looks like I'll need the community to help me out to sort through all of the different headsets.