Remove YAML setup option for EDL21 (#28350)

source/_integrations/edl21.markdown

@@ -31,26 +31,7 @@ Tested smart meters:
 - efr SGM-C4 (enable InF as described in manual to retrieve full data)
 - easymeter Q3 ([Link](https://www.easymeter.com/products/zaehler/q3a))
 
-## Configuration
-
-To set it up, add the following information to your `configuration.yaml` file:
-
-```yaml
-sensor:
-  - platform: edl21
-    serial_port: /dev/ttyUSB0
-```
-
-{% configuration %}
-name:
-  description: The friendly name of the smart meter.
-  required: false
-  type: string
-serial_port:
-  description: The device to communicate with. When using ser2net, use socket://host:port.
-  required: true
-  type: string
-{% endconfiguration %}
+{% include integrations/config_flow.md %}
 
 ## InF Mode