Update docs/configuring-playbook-ntfy.md: add the common section "Extending the configuration"

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

docs/configuring-playbook-ntfy.md

@@ -30,10 +30,6 @@ ntfy_enabled: true
 #   log_level: DEBUG
 ```
 
-For a more complete list of variables that you could override, see the [`defaults/main.yml` file](https://github.com/mother-of-all-self-hosting/ansible-role-ntfy/blob/main/defaults/main.yml) of the ntfy Ansible role.
-
-For a complete list of ntfy config options that you could put in `ntfy_configuration_extension_yaml`, see the [ntfy config documentation](https://ntfy.sh/docs/config/#config-options).
-
 ### Adjusting the ntfy URL (optional)
 
 By tweaking the `ntfy_hostname` variable, you can easily make the service available at a **different hostname** than the default one.
@@ -47,6 +43,16 @@ ntfy_hostname: push.example.com
 
 After changing the domain, **you may need to adjust your DNS** records to point the ntfy domain to the Matrix server.
 
+### Extending the configuration
+
+There are some additional things you may wish to configure about the component.
+
+Take a look at:
+
+- [ntfy role](https://github.com/mother-of-all-self-hosting/ansible-role-ntfy)'s [`defaults/main.yml`](https://github.com/mother-of-all-self-hosting/ansible-role-ntfy/blob/main/defaults/main.yml) for some variables that you can customize via your `vars.yml` file. You can override settings (even those that don't have dedicated playbook variables) using the `ntfy_configuration_extension_yaml` variable
+
+For a complete list of ntfy config options that you could put in `ntfy_configuration_extension_yaml`, see the [ntfy config documentation](https://ntfy.sh/docs/config/#config-options).
+
 ## Installing
 
 After configuring the playbook and potentially [adjusting your DNS records](#adjusting-dns-records), run the playbook with [playbook tags](playbook-tags.md) as below: