Update credits to include yhub in Stack section

...and remove Hocuspocus ref

Author: Nyco

README.md

@@ -275,7 +275,7 @@ While Docs is a public-driven initiative, our license choice is an invitation fo
 
 ### Stack
 
-Docs is built on top of [Django Rest Framework](https://www.django-rest-framework.org/), [Next.js](https://nextjs.org/), [ProseMirror](https://prosemirror.net/), [BlockNote.js](https://www.blocknotejs.org/), [HocusPocus](https://tiptap.dev/docs/hocuspocus/introduction), and [Yjs](https://yjs.dev/). We thank the contributors of all these projects for their awesome work!
+Docs is built on top of [Django Rest Framework](https://www.django-rest-framework.org/), [Next.js](https://nextjs.org/), [ProseMirror](https://prosemirror.net/), [BlockNote.js](https://www.blocknotejs.org/), [yhub](https://github.com/yjs/yhub), and [Yjs](https://yjs.dev/). We thank the contributors of all these projects for their awesome work!
 
 We are proud sponsors of [BlockNotejs](https://www.blocknotejs.org/) and [Yjs](https://yjs.dev/).