beaglebone-green-wifi.coffee: Point to the beaglebone yocto machine
beaglebone-green-wifi.coffee: Point to the beaglebone yocto machine

All the beaglebone family is now using the beaglebone black resinOS image.
We shall be using it this way until we will just keep the beaglebone black
device type and remove these obsolete types.

Also change the getting started guide links.

Signed-off-by: Florin Sarbu <3a837a37a2ac9072a088641ec330e0e5d5b86f4e@resin.io>

resin-os/resin-beaglebone,resin-os/resin-beaglebone