[WFLY-11689] Update the Getting Started guide's JDK advice.
[WFLY-11689] Update the Getting Started guide's JDK advice.

Also, replace HornetQ with ActiveMQ Artemis.

wildfly/wildfly,iweiss/wildfly,jstourac/wildfly,jstourac/wildfly,xasx/wildfly,rhusar/wildfly,pferraro/wildfly,xasx/wildfly,pferraro/wildfly,tadamski/wildfly,wildfly/wildfly,tadamski/wildfly,wildfly/wildfly,iweiss/wildfly,pferraro/wildfly,iweiss/wildfly,xasx/wildfly,rhusar/wildfly,rhusar/wildfly,iweiss/wildfly,pferraro/wildfly,tadamski/wildfly,jstourac/wildfly,jstourac/wildfly,rhusar/wildfly,wildfly/wildfly