Implement config flow for nextcloud (#26503)

source/_integrations/nextcloud.markdown

@@ -7,6 +7,7 @@ ha_category:
 ha_iot_class: Cloud Polling
 ha_release: 0.108
 ha_domain: nextcloud
+ha_config_flow: true
 ha_codeowners:
   - '@meichthys'
 ha_platforms:
@@ -31,28 +32,4 @@ This integration has the following Nextcloud Server prerequisites:
 - The Nextcloud 'Monitoring' app must be installed (__*Nextcloud*__ > __*Apps*__ > 🔍(Search Icon) > __*Monitoring*__ > __*Enable*__)
 - (Recommended) A Nextcloud App password should be generated for use in Home Assistant (__*Nextcloud*__ > __*Settings*__ > __*Personal*__ > __*Security*__ > __*Devices & sessions*__ > __*Create new app password*__)
 
-To enable the Nextcloud integration, add the following lines to your `configuration.yaml`:
-
-```yaml
-# Example configuration.yaml entry
-nextcloud:
-  url: https://YOUR_NEXTCLOUD_URL
-  username: YOUR_USERNAME
-  password: YOUR_APP_PASSWORD
-
-```
-
-{% configuration %}
-url:
-  description: The full URL to your Nextcloud instance.
-  required: true
-  type: string
-username:
-  description: The username of a Nextcloud user that has access to the Nextcloud monitor API.
-  required: true
-  type: string
-password:
-  description: The app password generated from the Nextcloud security settings page.
-  required: true
-  type: string
-{% endconfiguration %}
+{% include integrations/config_flow.md %}