Picsum photo gallery (basic)

Picsum id: 25

Add a change event listener to the slider
- Hide the current image (the "polaroid" becomes black)
- Change the src attribute of the image to https://picsum.photos/id/x/600/600 with x the value of the slider
- Let the new image fade in over a time period of 4s
Make this a 2-star exercise by disabling the slider until the fading effect is finished
TIP: change the attribute/property disabled and use a callback function (which is executed when the effect is completed) as the second parameter in the fadeIn() method