Some work on Scripts

notable changes:
- rename `bt-connect` to `bt_connect`
- rename `music` to `media` and make it generic instead of checking
  Spotify
- make separate script to set background to a preset black image
- make all shebangs "#!/usr/bin/env sh"

Scripts/.local/scripts/bt_connect

@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+
+choice=$(bluetoothctl devices | sed 's/Device \([A-Z0-9:]*\) \(.*\)/\2\t\1/g' | dmenu -i -p "Device: " | sed 's/.*\t//')
+[ ! -z $choice ] && bluetoothctl connect $choice