Document and test zero downtime application deployments

Closes https://gitlab.developers.cam.ac.uk/uis/devops/grails-application-ansible-deployment/-/issues/37

assigned to @ad2139

changed title from Draft: Resolve "Clarification: Can labels be applied to merge requests, and if so which" to Draft: Document and test zero downtime application deployments

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• 5d9f02e0 - Remove Software Sales

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• 85748d2c - Add documentation for new RHEL deploymentst

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marked this merge request as ready

added workflowReview Required label

requested review from @sdw37

added 2 commits

• f073cbb9 - Add additional detail about taking server our of service
• f7e71d20 - Reformatted RHEL deployment section

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resolved all threads

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merged

mentioned in commit db672116