Fix video

README.md

@@ -80,9 +80,7 @@ If you don't use a type checker, that information is ignored without any runtime
 
 Read on in [*Why?*](https://svcs.hynek.me/en/latest/why.html) or watch this short video if you're intrigued:
 
-<center>
-  <iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/d1elMD9WgpA?si=O1u02uxLQ5ancivX" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
-</center>
+[![Watch the video](https://img.youtube.com/vi/d1elMD9WgpA/maxresdefault.jpg)](https://youtu.be/d1elMD9WgpA)
 
 
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