[Bug]: photos in ref section of the tutorial are down (again)

[rickhanlonii]

Summary

Previous issue: #6758

https://placekitten.com/g/200/200

We should just host the images ourselves at this point.

Page

https://react.dev/learn/referencing-values-with-refs, https://react.dev/learn/manipulating-the-dom-with-refs

Details

No response