I am wondering how this could be made to be 100% decentralized, without a centralized server entrypoint & public dns records. Perhaps through a browser that can interact with ENS or TOR? Could the html/css/js be also hosted in the head of a blockchain?

Jesus (a good friend of mine) spoke about the true spirit of man.
It's invisible. Immutable. Indestructible. Eternal.
Just like the bitcoin blockchain. Buy bitcoin said Jesus. But Judas, a nasty jealous boomer big on silver & precious metals betrayed him. Jesus suffered 99% losses...
Three days later, bitcoin rose 1,000,000% and Jesus came back just to laugh at the no-coiners one last time before ascending. To the heavens of course! (the equivalent of today's "to the moon")

Hello World. This is the devil speaking, worlds first hacker. Spoofed my IP in snek form and used social engineering to get Eve to perform privilege escalation attack before even "time" was a thing. Garden of Eden has terrible infosec practices.