Update docs url

[MabezDev]

No description provided.

[Vollbrecht]

@MabezDev this is still hosted by github, just with its own domain right?
I wonder if we can expand the generated docs for each different target, e.g instead of https://docs.esp-rs.org/esp-idf-sys/ have https://docs.esp-rs.org/esp32c3/esp-idf-sys/ - https://docs.esp-rs.org/esp32c6/esp-idf-sys/ and so forth. The reason for such a format would be that we would not need to inject or change anything to the build output itself(e.g no extra html or js), so no extra burden, but we would still get the benefit of correctly generated docs for each target.

Regardless do we need to change anything with respect to our publishing procedure in our CI?

[MabezDev]

Yes, it's just a wrapper around github docs. Nothing needs doing for this to work (you can go to the URL right now and see).

For multichip docs, you can see: https://docs.esp-rs.org/esp-hal/ we just made a simple index that links to each chips docs - feel free to copy and paste that and change what you need :).