Integrate "settings & quit" into the design & properly align icon with the side panel window

[Zatline]

Some icons have slightly changed so the icons need to be updated:

• Either use the icons seperated, with coherent naming or use this
• Take note the icons are slightly smaller than the buttons they are inside of
• Keep the exit button red (as is) when hovering over it
• get rid of the Unicode symbols for "exit" and "settings", use the provided icons instead.

• The center of the arrow icon marks the boundery for the side panel