Ensure Walker can't just die and stay dead (#4555)

install/config/walker-elephant.sh

@@ -4,6 +4,10 @@
 mkdir -p ~/.config/autostart/
 cp $OMARCHY_PATH/default/walker/walker.desktop ~/.config/autostart/
 
+# And is restarted if it crashes or is killed
+mkdir -p ~/.config/systemd/user/app-walker@autostart.service.d/
+cp $OMARCHY_PATH/default/walker/restart.conf ~/.config/systemd/user/app-walker@autostart.service.d/restart.conf
+
 # Create pacman hook to restart walker after updates
 sudo mkdir -p /etc/pacman.d/hooks
 sudo tee /etc/pacman.d/hooks/walker-restart.hook > /dev/null << EOF