vr: add note about fo4 vr

etcnixos/vr.nix

@@ -6,6 +6,10 @@
 }:
 {
 
+  # for FO4 VR:
+  # doesn't work. it's like the wivrn stuff doesn't transfer past MO2
+  # `echo "PRESSURE_VESSEL_FILESYSTEMS_RW=$XDG_RUNTIME_DIR/wivrn/comp_ipc %command%" | sed -r "s/proton waitforexitandrun .*/proton waitforexitandrun \/media\/games\/fallout4vr_essentials_overhaul\/ModOrganizer.exe \"moshortcut:\/\/:Play Fallout Essentials\" /" | sh`
+
   services.wivrn = {
     enable = true;
     openFirewall = true;