Fix location of deploy-on-release badge.
Fix location of deploy-on-release badge.

nickerso/libcellml,nickerso/libcellml,cellml/libcellml,nickerso/libcellml,cellml/libcellml,nickerso/libcellml,cellml/libcellml,hsorby/libcellml,hsorby/libcellml,cellml/libcellml,hsorby/libcellml,hsorby/libcellml