Enhancement: support basic auth to ESPHome widget (#4429)

docs/widgets/services/esphome.md

@@ -16,5 +16,6 @@ To group both `offline` and `unknown` devices together, users should use the `of
 widget:
   type: esphome
   url: http://esphome.host.or.ip:port
-  key: myesphomecookie # only if auth enabled, get the value from a request from the frontend e.g. `authenticated=myesphomecookie`
+  username: myesphomeuser # only if auth enabled
+  password: myesphomepass # only if auth enabled
 ```