polybar: Don't hardcode monitor to display on

Now polybar will show on all monitors by default, and we don't have to
update the script every time those monitors change, useful when changing
between computers that use HDMI and computers that use display port, for
example.

polybar/.config/polybar/config

@@ -17,7 +17,7 @@ modules-left                = bspwm
 modules-center              = window
 modules-right               = cpu ram volume wifi date time battery
 
-monitor                     = eDP
+monitor                     = ${env:MONITOR:}
 wm-restack                  = bspwm
 include-file                = $HOME/.cache/polybar/config
 

polybar/.config/polybar/launch.sh

@@ -52,5 +52,7 @@ echo $BSPWM_TOP_PADDING > $HOME/.cache/polybar/bspwm_top_padding
 # Wait until there are no more polybar instances running
 while pgrep -u $UID -x polybar >/dev/null; do sleep 1; done
 
-# Start polybar
-polybar main &
+# Start polybar programmatically on all monitors by default
+for m in $(polybar --list-monitors | cut -d":" -f1); do
+  MONITOR=$m polybar main &
+done