Toggle light / dark theme

https://www.youtube.com/watch?v=IADdW-Af7nA

https://www.youtube.com/watch?v=GfRJMABvNK4

https://www.youtube.com/watch?v=Uth_NY0bFBk

https://www.youtube.com/watch?v=9z2bjVhDpBg&t=1s

https://www.youtube.com/watch?v=_GhILbDK0mA

https://www.youtube.com/watch?v=-KvghKch12o&t=1s