Deprecate Dune HD YAML configuration (#68381)

Co-authored-by: Franck Nijhof <frenck@frenck.nl>

homeassistant/components/dunehd/config_flow.py

@@ -76,6 +76,12 @@ class DuneHDConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
         self, user_input: dict[str, str] | None = None
     ) -> FlowResult:
         """Handle configuration by yaml file."""
+        _LOGGER.warning(
+            "Configuration of the Dune HD integration in YAML is deprecated and will be "
+            "removed in Home Assistant 2022.6; Your existing configuration "
+            "has been imported into the UI automatically and can be safely removed "
+            "from your configuration.yaml file"
+        )
         assert user_input is not None
         host: str = user_input[CONF_HOST]