Update index.md

Remove outdated (?) info that Addon users define their configs in the GUI. Corrected outdated (?) config,yml to frigate.yml.

docs/docs/configuration/index.md

@@ -3,7 +3,7 @@ id: index
 title: Configuration
 ---
 
-HassOS users can manage their configuration directly in the addon Configuration tab. For other installations, the default location for the config file is `/config/config.yml`. This can be overridden with the `CONFIG_FILE` environment variable. Camera specific ffmpeg parameters are documented [here](cameras.md).
+For all installations, including for HassOS, the default location for the config file is `/config/frigate.yml`. This can be overridden with the `CONFIG_FILE` environment variable. Camera specific ffmpeg parameters are documented [here](cameras.md).
 
 It is recommended to start with a minimal configuration and add to it: