If you want to use IPFS, you can either import IPFS as a library (which this application does, everything is P2P in the browser, by using js-ipfs and including it in the application, you can see it in the annotated source here: https://ipfs.io/ipfs/QmbZVv9q52znhF9wN6GVi55EJQYq2BR6oeTgzVn...) or you can connect to a gateway.
If you want to use IPFS, you can either import IPFS as a library (which this application does, everything is P2P in the browser, by using js-ipfs and including it in the application, you can see it in the annotated source here: https://ipfs.io/ipfs/QmbZVv9q52znhF9wN6GVi55EJQYq2BR6oeTgzVn...) or you can connect to a gateway.