Add devref/devstack to docs index
Add devref/devstack to docs index

Make devref/devstack discoverable instead of being unlinked.

Change-Id: I75d478a410d721f21f24381aa9566bda1e5e3105

tellesnobrega/sahara,keedio/sahara,zhangjunli177/sahara,zhujzhuo/Sahara,zhujzhuo/Sahara,citrix-openstack-build/sahara,egafford/sahara,matips/iosr-2015,esikachev/sahara-backup,henaras/sahara,esikachev/scenario,keedio/sahara,zhujzhuo/Sahara,henaras/sahara,ekasitk/sahara,esikachev/scenario,ekasitk/sahara,egafford/sahara,xme1226/sahara,crobby/sahara,matips/iosr-2015,mapr/sahara,mapr/sahara,esikachev/scenario,redhat-openstack/sahara,henaras/sahara,xme1226/sahara,ekasitk/sahara,matips/iosr-2015,bigfootproject/sahara,crobby/sahara,crobby/sahara,esikachev/sahara-backup,citrix-openstack-build/sahara,openstack/sahara,keedio/sahara,zhangjunli177/sahara,bigfootproject/sahara,citrix-openstack-build/sahara,mapr/sahara,bigfootproject/sahara,zhangjunli177/sahara,esikachev/sahara-backup,openstack/sahara,xme1226/sahara,tellesnobrega/sahara,redhat-openstack/sahara,redhat-openstack/sahara