bug 1218563: Update development docs for Docker
bug 1218563: Update development docs for Docker

Update the development documentation to refer to either the Vagrant or
the Docker environments, pointing out differences as needed.

yfdyh000/kuma,jwhitlock/kuma,SphinxKnight/kuma,jwhitlock/kuma,a2sheppy/kuma,mozilla/kuma,safwanrahman/kuma,ollie314/kuma,mozilla/kuma,safwanrahman/kuma,a2sheppy/kuma,a2sheppy/kuma,jwhitlock/kuma,yfdyh000/kuma,SphinxKnight/kuma,a2sheppy/kuma,SphinxKnight/kuma,Elchi3/kuma,escattone/kuma,ollie314/kuma,ollie314/kuma,SphinxKnight/kuma,ollie314/kuma,yfdyh000/kuma,Elchi3/kuma,yfdyh000/kuma,mozilla/kuma,SphinxKnight/kuma,ollie314/kuma,mozilla/kuma,ollie314/kuma,safwanrahman/kuma,Elchi3/kuma,escattone/kuma,a2sheppy/kuma,Elchi3/kuma,safwanrahman/kuma,yfdyh000/kuma,safwanrahman/kuma,jwhitlock/kuma,mozilla/kuma,safwanrahman/kuma,Elchi3/kuma,yfdyh000/kuma,escattone/kuma,jwhitlock/kuma,SphinxKnight/kuma