Added video to overview page (#20753)

Author: dcpena

src/content/docs/fundamentals/index.mdx

@@ -8,7 +8,7 @@ sidebar:
 
 import { Render } from "~/components"
 
-Cloudflare helps connect and protect millions of customers globally. Everyone from individuals to the world's largest enterprises use our unified platform of networking, security, and developer services to succeed everywhere in the world.
+<Render file="what-is-cloudflare" product="fundamentals" />
 
 Before you get started, we recommend reviewing [Concepts](/fundamentals/concepts/) to learn about key concepts related to using different Cloudflare products.