Update docs/configuring-playbook-prometheus-postgres.md: add the copyright header before deleting the file

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# Enabling metrics and graphs for Postgres (optional)
Expanding on the metrics exposed by the [synapse exporter and the node exporter](configuring-playbook-prometheus-grafana.md), the playbook enables the [postgres exporter](https://github.com/prometheus-community/postgres_exporter) that exposes more detailed information about what's happening on your postgres database.