Yew tutorial not working correctly?

Hi! I tried out yew last night and was going through the tutorial (the link). At the end the tutorial is using a link to an external resource. My guess is that the tutorial app shall create a website with a list of (empty) videos that is created by reading an external json-file from the yew-website. The problem is that this doesn't work for me, the list stays empty. I also don't find the full source of this example somewhere. On the site it is only iteratively described. I am pretty sure I have everything like on the website.