Hammerspoon: simplify set-window-fraction; start counting positions at 0
Hammerspoon: simplify set-window-fraction; start counting positions at 0

This makes a lot more sense to me. First arg to `move-active-window` is
position (starting at 0), second is number of parts to split the screen,
third argument is number of those parts the window should take up.

kbd/setup,kbd/setup,kbd/setup,kbd/setup,kbd/setup