Review diagrams in Introducing AMQ 7 guide

The Introducing AMQ 7 guide has a number of diagrams that show common deployment patterns. See here: https://access.redhat.com/documentation/en-us/red_hat_amq/7.7/html/introducing_red_hat_amq_7/common_deployment_patterns

This issue is to track:

• Conducting a fresh technical review of these diagrams
• Investigating whether we should update the diagrams to bring them in line with more recent diagrams in the AMQ documentation in terms of style and labeling standards