docs: Add embedded installation video

docs/installation.mdx

@@ -13,6 +13,19 @@ Install Tracecat locally on your machine.
 _NOTE: The default setup is not intended for production use, but rather for
 development and testing purposes._
 
+## Video Tutorial
+
+<iframe
+  width="560"
+  height="315"
+  src="https://www.youtube.com/watch?v=JE79sa2KCyk"
+  title="Installation Tutorial"
+  frameborder="0"
+  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
+  referrerpolicy="strict-origin-when-cross-origin"
+  allowfullscreen
+></iframe>
+
 ## Prerequisites
 
 ### Required