Update nextbus docs for config flow (#27198)

source/_integrations/nextbus.markdown

@@ -6,6 +6,7 @@ ha_category:
   - Transport
 ha_iot_class: Cloud Polling
 ha_release: 0.93
+ha_config_flow: true
 ha_codeowners:
   - '@vividboarder'
 ha_domain: nextbus
@@ -16,41 +17,4 @@ ha_integration_type: integration
 
 The `nextbus` sensor will give you the next departure time and associated data from your public transit station/stop. The data comes from [NextBus](https://www.nextbus.com), which provides real time transit data for a number of transit authorities.
 
-It is possible to get the tag information from the NextBus website.
-
-  1. Visit https://www.nextbus.com/
-  2. Use the drop downs to select the transit system, route, direction, and stop
-  3. Extract the tags from the URL. It is constructed with the following pattern:
-
-    https://www.nextbus.com/#!/<agency>/<route>/<direction>/<stop>
-
-If tags are incorrect, valid ones will be displayed in the logs as a convenience. Note that the `<direction>` tag is not used in this integration.
-
-```yaml
-# Example configuration.yaml entry
-sensor:
-  - platform: nextbus
-    agency: AGENCY_TAG
-    route: ROUTE_TAG
-    stop: STOP_TAG
-```
-
-{% configuration %}
-agency:
-  description: The agency tag from NextBus.
-  required: true
-  type: string
-route:
-  description: The route tag from NextBus.
-  required: true
-  type: string
-stop:
-  description: The stop tag from NextBus.
-  required: true
-  type: string
-name:
-  description: Name to use in the frontend.
-  required: false
-  default: <Agency> - <Route>
-  type: string
-{% endconfiguration %}
+{% include integrations/config_flow.md %}