New keyboard shortcut for Bluetooth Headphones

See merge request !1

- To enable switching my bluetooth headphones on and off easily, added a
new keyboard shortcut to turn them off and on
- Tried a toggle shortcut but bluetoothctl return 'connected yes' even
when it hasn't connected properly so need the ability to keep trying to
turn on until it actually connects

- Updated status bar size and active window colours
- Removed No Battery warning for when on desktop
- New colours for terminal and command prompt

- Wondered why my display mode wasn't working - ubuntu update
changed my external display names

- For extra nice touchpad controls on laptop

- Simple bash script to install everything and then symlink into home
directory

- Change to dark grey and white font

- Set font awesome for status bar
- Change layout and icons
- Change date format