postgresql: Configure for dedicated DB servers
I am going to use the *postgresql* group for the dedicated database servers. The configuration for those machines will be quite a bit different than for the one existing machine that is a member of that group already: the Nextcloud server. Rather than undefine/override all the group-level settings at the host level, I have removed the Nextcloud server from the *postgresql* group, and updated the `nextcloud.yml` playbook to apply the *postgresql-server* role itself. Eventually, I want to move the Nextcloud database to the central database servers. At that point, I will remove the *postgresql-server* role from the `nextcloud.yml` playbook.
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