Homepage README edits, move getting started higher
Homepage README edits, move getting started higher

Our README intro was a bit wordy so I tried tightening it up a bit. Also moved the getting started table above the fold so people can see it without scrolling
DDReaper/MixedRealityToolkit-Unity,killerantz/HoloToolkit-Unity,killerantz/HoloToolkit-Unity,killerantz/HoloToolkit-Unity,killerantz/HoloToolkit-Unity