Update configuration description (#5726)

source/_components/sensor.lastfm.markdown

@@ -16,9 +16,13 @@ ha_release: "0.20"
 
 The `lastfm` sensor platform will allow you to see whenever a user starts scrobbling, their play count, last song played, and top song played on [Last.fm](http://www.last.fm).
 
+## {% linkable_title Setup %}
+
 To get an API key you need to create an [API account](http://www.last.fm/api/account/create).
 
-To use Last.fm with your installation, add the following to your `configuration.yaml` file:
+## {% linkable_title Configuration %}
+
+To use Last.fm sensor with your installation, add the following to your `configuration.yaml` file:
 
 ```yaml
 # Example configuration.yaml entry
@@ -30,9 +34,16 @@ sensor:
       - user2
 ```
 
-Configuration variables:
-
-- **api_key** (*Required*): Your API key.
-- **users** array (*Required*): Array of users.
-  - **username** (*Required*): Username of the user.
-
+{% configuration %}
+api_key:
+  description: Your Last.fm API key.
+  required: true
+  type: string
+users:
+  description: List of users.
+  required: true
+  type: map
+  keys:
+    username:
+      description: Username of the user to monitor.
+{% endconfiguration %}