docs: update the installation notes for KIE Server
docs: update the installation notes for KIE Server

 * step by step guides to install the WARs on different
   containers should hopefully make the entire
   installation process easier for users

manstis/drools,sutaakar/droolsjbpm-knowledge,reynoldsm88/droolsjbpm-knowledge,winklerm/drools,rsynek/droolsjbpm-knowledge,winklerm/drools,winklerm/drools,Multi-Support/droolsjbpm-knowledge,winklerm/drools,manstis/drools,winklerm/drools,sotty/droolsjbpm-knowledge,manstis/drools,reynoldsm88/droolsjbpm-knowledge,rsynek/droolsjbpm-knowledge,bernardator/droolsjbpm-knowledge,Multi-Support/droolsjbpm-knowledge,sotty/droolsjbpm-knowledge,sutaakar/droolsjbpm-knowledge,manstis/drools,manstis/drools,droolsjbpm/droolsjbpm-knowledge,droolsjbpm/droolsjbpm-knowledge,bernardator/droolsjbpm-knowledge