Update README with improvements and corrections

See merge request !156

- Fixed JSON code block syntax and structure in Data Flow section
- Added hyperlinks to CentOS setup steps for RabbitMQ configuration
- Added vhost config

Revert "Merge branch 'feat-readme' into 'main'"

See merge request rc/rabbitmq_agents!157

This reverts merge request !155

Feat readme

See merge request !155

Add user to default groups

Closes gpfs5-migration#22

See merge request rc/rabbitmq_agents!153

Add script to move between groups

Closes gpfs5-migration#30

See merge request !154

Fix account cli

See merge request rc/rabbitmq_agents!152

Feat group manager

See merge request !146

fix(user_reg_event_logger): remove assumption on routing_key

See merge request rc/rabbitmq_agents!151

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