docs(consensus.mdx): replace video link with embedded video for better user experience and accessibility

Author: MartinMinkov

docs/about-mina/consensus.mdx

@@ -10,7 +10,13 @@ Consensus is the process by which the network determines which information is re
 
 Learn more about how Ouroboros Samasika works in this video:
 
-[![What is Ouroboros Samisika?](https://res.cloudinary.com/marcomontalbano/image/upload/v1661971904/video_to_markdown/images/youtube--NpjuGYcJICA-c05b58ac6eb4c4700831b2b3070cd403.jpg)](https://www.youtube.com/watch?v=NpjuGYcJICA "What is Ouroboros Samisika?")
+<iframe
+  width="900"
+  height="550"
+  src="https://www.youtube.com/embed/NpjuGYcJICA"
+  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
+  allowfullscreen
+></iframe>
 
 ### Decentralization properties
 Based on Cardano’s PoS Ouroboros, Ouroboros Samisika is a secure PoS protocol with some strong decentralization properties: