website: Update GCN3 docker image + square documentation

* Add documentation stating there's a pre-built docker image and how
to use it

* Update documentation regarding how to run square, as the structure
of gem5-resources changed since the documentation was written

Change-Id: I6b0cbdf6c191c8584edf9a34deaf916f969ec6ff
Reviewed-by: Matt Sinclair <>
Reviewed-by: Bobby R. Bruce <>
Maintainer: Matt Sinclair <>
Maintainer: Bobby R. Bruce <>
Tested-by: Bobby R. Bruce <>
1 file changed