Update README with improvements and corrections

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

assigned to @krish94

added 9 commits

• 909ed6bc...b14c26c8 - 4 commits from branch rc:main
• a3ca071c - Update README with improvements and corrections
• d45dc138 - added initial instructions to setup and configure rabbitmq on a standalone vm (alma9) on openstack
• 81b594bc - fixed code block in import security keys section
• 50649fec - Add systemd service files for ohpc_account_agent, ood_account_agent, and slurm_agent
• c6b96aa5 - fixed typo

Compare with previous version

mentioned in commit a93b8ea1

merged

mentioned in issue #166 (closed)