Add autoreloading development server

[r-tae]

No description provided.

[ptsefton]

Is this still relevant @r-tae?

[r-tae]

Yeah its still helpful and the conflicts will be easy to fix

The question is just whether we are okay with shipping this line in every output; it won't do anything unless its served on localhost but its not very elegant to have it there for all future ro-crate-previews

if (window.location.hostname === "localhost") {
  import("/script/simple-live-reload.js");
}