Update install instructions after rashomon -> restbase-cassandra rename
Update install instructions after rashomon -> restbase-cassandra rename

milimetric/restbase,physikerwelt/restbase,inverno/restbase,wikimedia/mediawiki-services-restbase,d00rman/restbase,Pchelolo/restbase,wikimedia/restbase,wikimedia/mediawiki-services-restbase,Krenair/restbase,gwicke/restbase,Pchelolo/restbase,Krenair/restbase,wikimedia/restbase,cscott/restbase,hardikj/restbase,d00rman/restbase,eevans/restbase,gwicke/restbase,milimetric/restbase,hardikj/restbase,cscott/restbase,wikimedia/hyperswitch,inverno/restbase,eevans/restbase,physikerwelt/restbase