Nightly docs: more crates

[FredrikNoren]

We should publish ambient_ui, ambient_editor_derive and ambient_cb there as well

[philpax]

This all works (aside from ambient_editor_derive, need to figure out what's going on there) for stable and nightly (awesome work, @pierd!): https://docs.ambient.run/0.3.0/ambient_ui/index.html and https://docs.ambient.run/nightly/ambient_api/index.html

I'll take a look at ambient_editor_derive but this is almost done otherwise 🙏

[philpax]

Ok, it looks like ambient_editor_derive cannot be included in the docs because of rust-lang/cargo#7677 - the API is built for wasm32-wasi, but the proc macro crate is built for the host platform, so the latter doesn't get included in the former. We can copy it in, but the links will still be broken/missing, so it's a bit pointless.

@FredrikNoren should we close this now that we have the docs uploaded and there's not much we can do about editor_derive?