Move scripts into respective directories

Having a general script folder makes little sense if the scripts are
targeted to specific applications. This commit moved every script that
solely, or mainly (like ueberzug), targets a single application into
that respective stow module.

polybar/.local/bin/polybar-launch

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+# Terminate already running bar instances
+killall -q polybar
+
+# Wait until the processes have been shut down
+while pgrep -u $UID -x polybar >/dev/null; do sleep 1; done
+
+startbars() {
+  for bar in "$@"; do
+    local logfile="/tmp/polybar-$bar.log"
+    printf -- "---\npolybar: %s starting...\n---\n" "$bar" | tee -a "$logfile"
+    polybar "$bar" >>"$logfile" 2>&1 &
+  done
+}
+
+startbars "$@"
+echo "Polybars launched..."