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/st-scripts/output-copy.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 # From https://github.com/LukeSmithxyz/st
 
 # By Jaywalker and Luke