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/background

@@ -1,4 +1,3 @@
-#!/bin/bash
+#!/usr/bin/env sh
 
 feh --bg-fill --randomize $HOME/Pictures/Backgrounds;
-# feh --bg-fill $HOME/Pictures/Backgrounds/black.jpg;