add vercel banner

Author: YousefED

README.md

@@ -105,3 +105,7 @@ BlockNote builds directly on two awesome projects; [Prosemirror](https://prosemi
 BlockNote is built as part of [TypeCell](https://www.typecell.org). TypeCell is proudly sponsored by the renowned [NLNet foundation](https://nlnet.nl/foundation/) who are on a mission to support an open internet, and protect the privacy and security of internet users. Check them out!
 
 <a href="https://nlnet.nl"><img src="https://nlnet.nl/image/logos/NGIAssure_tag.svg" alt="NLNet" width="100"></a>
+
+Hosting and deployments powered by Vercel:
+
+<a href="https://vercel.com/?utm_source=TypeCell&utm_campaign=oss"><img src="https://images.ctfassets.net/e5382hct74si/78Olo8EZRdUlcDUFQvnzG7/fa4cdb6dc04c40fceac194134788a0e2/1618983297-powered-by-vercel.svg" alt="NLNet" width="150"></a>