Invalid images on training.play-with-docker.com #245
Description
In the Learn more section the images are referring to invalid URIs (404):
https://www.docker.com/sites/default/files/d8/styles/500px_6_4_ratio/public/2020-03/Compacted-light%20bkgr.png?itok=Y5Z2Iw79
https://www.docker.com/sites/default/files/d8/styles/role_icon/public/2020-01/Moby%20Group.jpeg?itok=kmD1NvVU
