Update docker.md for styling and branding
Update docker.md for styling and branding

A little rephrasing and the addition of the IMG logo
DavidAntliff/AwaLWM2M,DavidAntliff/AwaLWM2M,FlowM2M/AwaLWM2M,FlowM2M/AwaLWM2M,DavidAntliff/AwaLWM2M,FlowM2M/AwaLWM2M,DavidAntliff/AwaLWM2M,FlowM2M/AwaLWM2M