Update maintenance-and-troubleshooting.md: create sections "Maintenance" and "Troubleshooting"

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

docs/maintenance-and-troubleshooting.md

@@ -1,6 +1,24 @@
 # Maintenance and Troubleshooting
 
-## How to see the current status of your services
+## Maintenance
+
+### Remove unused Docker data
+
+You can free some disk space from Docker by removing its unused data. See [docker system prune](https://docs.docker.com/engine/reference/commandline/system_prune/) for more information.
+
+```sh
+ansible-playbook -i inventory/hosts setup.yml --tags=run-docker-prune
+```
+
+The shortcut command with `just` program is also available: `just run-tags run-docker-prune`
+
+### Postgres
+
+See the dedicated [PostgreSQL Maintenance](maintenance-postgres.md) documentation page.
+
+## Troubleshooting
+
+### How to see the current status of your services
 
 You can check the status of your services by using `systemctl status`. Example:
 
@@ -12,7 +30,7 @@ sudo systemctl status matrix-synapse
      Active: active (running) since Sun 2024-01-14 09:13:06 UTC; 1h 31min ago
 ```
 
-## How to see the logs
+### How to see the logs
 
 Docker containers that the playbook configures are supervised by [systemd](https://wiki.archlinux.org/title/Systemd) and their logs are configured to go to [systemd-journald](https://wiki.archlinux.org/title/Systemd/Journal).
 
@@ -26,7 +44,7 @@ Available service names can be seen by doing `ls /etc/systemd/system/matrix*.ser
 
 We just simply delegate logging to journald and it takes care of persistence and expiring old data.
 
-### Enable systemd/journald logs persistence
+#### Enable systemd/journald logs persistence
 
 On some distros, the journald logs are just in-memory and not persisted to disk.
 
@@ -43,7 +61,7 @@ RateLimitBurst=0
 Storage=persistent
 ```
 
-## How to check if services work
+### How to check if services work
 
 The playbook can perform a check to ensure that you've configured things correctly and that services are running.
 
@@ -58,17 +76,3 @@ The shortcut command with `just` program is also available: `just run-tags self-
 If it's all green, everything is probably running correctly.
 
 Besides this self-check, you can also check whether your server federates with the Matrix network by using the [Federation Tester](https://federationtester.matrix.org/) against your base domain (`example.com`), not the `matrix.example.com` subdomain.
-
-## Remove unused Docker data
-
-You can free some disk space from Docker by removing its unused data. See [docker system prune](https://docs.docker.com/engine/reference/commandline/system_prune/) for more information.
-
-```sh
-ansible-playbook -i inventory/hosts setup.yml --tags=run-docker-prune
-```
-
-The shortcut command with `just` program is also available: `just run-tags run-docker-prune`
-
-## Postgres
-
-See the dedicated [PostgreSQL Maintenance](maintenance-postgres.md) documentation page.