Update docs/configuring-playbook.md: create "Administration" section

Reorganize "Additional useful services" section and "Other specialized services" section

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook.md

@@ -189,26 +189,28 @@ When you're done with all the configuration you'd like to do, continue with [Ins
 
 - [Setting up Buscarron](configuring-playbook-bot-buscarron.md) - a bot you can use to send any form (HTTP POST, HTML) to a (encrypted) Matrix room
 
-### Additional useful services
+### Administration
 
-- [Setting up the Jitsi video-conferencing platform](configuring-playbook-jitsi.md)
-
-- [Setting up Etherpad](configuring-playbook-etherpad.md)
+- [Setting up Prometheus Alertmanager integration via matrix-alertmanager-receiver](configuring-playbook-alertmanager-receiver.md)
 
 - [Enabling metrics and graphs (Prometheus, Grafana) for your Matrix server](configuring-playbook-prometheus-grafana.md)
 
 - [Enabling metrics and graphs for NginX logs](docs/configuring-playbook-prometheus-nginxlog.md)
 
+- [Setting up the rageshake bug report server](configuring-playbook-rageshake.md)
+
 - [Enabling synapse-usage-exporter for Synapse usage statistics](configuring-playbook-synapse-usage-exporter.md)
 
-### Backups
+- Backups:
+  - [Setting up BorgBackup](configuring-playbook-backup-borg.md) - a full Matrix server backup solution, including the Postgres database
 
-- [Setting up BorgBackup](configuring-playbook-backup-borg.md) - a full Matrix server backup solution, including the Postgres database
+  - [Setting up postgres backup](configuring-playbook-postgres-backup.md) - a Postgres-database backup solution (note: does not include other files)
 
-- [Setting up postgres backup](configuring-playbook-postgres-backup.md) - a Postgres-database backup solution (note: does not include other files)
+### Other specialized services
 
+- [Setting up the Jitsi video-conferencing platform](configuring-playbook-jitsi.md)
 
-### Other specialized services
+- [Setting up Etherpad](configuring-playbook-etherpad.md)
 
 - [Setting up synapse-auto-compressor](configuring-playbook-synapse-auto-compressor.md) for compressing the database on Synapse homeservers
 
@@ -222,10 +224,6 @@ When you're done with all the configuration you'd like to do, continue with [Ins
 
 - [Setting up Cactus Comments](configuring-playbook-cactus-comments.md) - a federated comment system built on Matrix
 
-- [Setting up the rageshake bug report server](configuring-playbook-rageshake.md)
-
-- [Setting up Prometheus Alertmanager integration via matrix-alertmanager-receiver](configuring-playbook-alertmanager-receiver.md)
-
 ### Deprecated / unmaintained / removed services
 
 **Note**: since a deprecated or unmaintained service will not be updated, its bug or vulnerability will be unlikely to get patched. It is recommended to migrate from the service to an alternative if any, and make sure to do your own research before you decide to keep it running nonetheless.