Document disabling SteamVR controller autolaunch

content/docs/fossvr/monado/_index.md

@@ -31,6 +31,18 @@ To use Monado as the OpenXR runtime with Steam, or if you're planning to use the
 
 In order to use the SteamVR lighthouse driver in Monado, you just need to set the environment variable `STEAMVR_LH_ENABLE=true`.
 
+You may want to disable SteamVR automatically starting whenever you turn on your controllers, because this will interfere with trying to use them with Monado.
+To do this:
+1. Launch SteamVR at least once, to create the `<steam install directory>/config/steamvr.vrsettings` file
+    - `<steam install directory>` is probably `~/.steam/steam` or `~/.local/share/Steam`
+2. Add the following section to the end of the file, before the last closing brace:
+
+        "power" : {
+          "autoLaunchSteamVROnButtonPress" : false
+        }
+    - This is a JSON file, so be sure that you add a comma to the end of the previous close brace.
+3. Launch SteamVR again to apply the config.
+
 OpenComposite is REQUIRED to operate Monado in conjunction with Steam games. Proton requires a functional OpenVR API to utilize OpenXR at all and Proton itself is required for VR to function as normal wine does not carry any of the needed patches nor does "protonified" wine something like Lutris would provide.
 
 ### Fix View