https://bafybeic4blel5vf4il73n3nzt6vw7npsov6or3cp3myjms4npii...
It's a static, client-side app with no server component, so it's not surprising that someone noticed that it works just as well if the same files are served from IPFS.
Someone could create a friendlier URL via Cloudflare's public IPFS gateway and DNSLink[0], though that does introduce a potential point of failure (DNS). (Those with the IPFS Companion extension or the Brave browser would be redirected to their local IPFS node, so it would only be partly dependent on Cloudflare. However, someone has to pay for the domain.)
[0] https://developers.cloudflare.com/distributed-web/ipfs-gatew...
But so long as you have those two files in a folder, you can open index.html and it'll work fine. My friends and I have been putting in joke words in a shared clone for each other and hosting it on GitHub Pages.