text: Title: ✨ Add a PDF reader in docs
  Body: ## Feature Request
  
  We can now integrate PDF on our docs, it could be nice to be able to see them directly from the editor.
  An example is available here:
  https://www.blocknotejs.org/examples/custom-schema/pdf-file-block
  
  See:
  https://github.com/TypeCellOS/BlockNote/tree/6aec6e2940d5732a5d6003f821faf218fdeed3eb/examples/06-custom-schema/04-pdf-file-block