UNTRACKED: chore: update pg version

[mikelax]

Overview

• Upgrade postgres version from 12 to 13
• Make use of docker compose v2 files, use docker compose (space, not dash)
• Use include to reduce duplicate container definitions between the two compose files
• Update docs with the above changes

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• Additional units tests have been added to prove code updates work and fixes are effective
• Additional documentation has been added (if appropriate)
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