Update root http URL to expose non-app endpoints

Additionally update quarkus version to more modern version

src/main/java/org/eclipsefoundation/mailing/resources/MailingListsResource.java

@@ -41,7 +41,7 @@ import org.jboss.resteasy.specimpl.MultivaluedMapImpl;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-@Path("/mailing-lists")
+@Path("")
 @Produces(MediaType.APPLICATION_JSON)
 public class MailingListsResource {
     private static final Logger LOGGER = LoggerFactory.getLogger(MailingListsResource.class);