update iframe to videoembed

Author: im2nguyen

website/docs/intro/index.mdx

@@ -31,8 +31,7 @@ The core Terraform workflow consists of three stages:
 
 HashiCorp co-founder and CTO Armon Dadgar explains how Terraform solves infrastructure challenges.
 
-<iframe src="https://www.youtube.com/embed/h970ZBgKINg" frameborder="0" allowfullscreen="true"  width="560" height="315" ></iframe>
-
+<VideoEmbed url="https://www.youtube.com/embed/h970ZBgKINg"/>
 
 ### Manage any infrastructure