Add polybar launch script

.config/polybar/launch.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env sh
+
+# Terminate already running bar instances
+killall -q polybar
+
+# Wait until the processes have been shut down
+while pgrep -u $UID -x polybar >/dev/null; do sleep 1; done
+
+# Launch polybar
+polybar default &