docs: add video for raspberry pi install

This PR adds a quick how-to on installing talos on rpi.

Signed-off-by: Spencer Smith <robertspencersmith@gmail.com>

website/content/docs/v0.9/Single Board Computers/rpi_4.md

@@ -3,6 +3,11 @@ title: "Raspberry Pi 4 Model B"
 description: "Installing Talos on Rpi4 SBC using raw disk image."
 ---
 
+## Video Walkthrough
+
+To see a live demo of this writeup, see the video below:
+<iframe width="560" height="315" src="https://www.youtube.com/embed/aHu1lFir7UU" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+
 ## Prerequisites
 
 You will need