Update jj vcs docs links to new jj-vcs.dev domain

Author: edaniels

src/hello-world/how-to-install.md

@@ -7,7 +7,7 @@ For the full range of ways to install `jj`, you can visit the [Installation and
 Setup][install] page of the official documentation. Personally, because I am
 a Rust developer, and `jj` is written in Rust, I installed my copy like this:
 
-[install]: https://martinvonz.github.io/jj/latest/install-and-setup/
+[install]: https://docs.jj-vcs.dev/latest/install-and-setup/
 
 ```console
 $ cargo install jj-cli@0.23.0 --locked

src/introduction/introduction.md

@@ -49,5 +49,5 @@ Anyway, let's get on with it.
 [jj]: https://github.com/martinvonz/jj
 [r4r]: https://github.com/steveklabnik/rust_for_rubyists
 [chris]: https://v5.chriskrycho.com/essays/jj-init/
-[jj-vevo]: https://martinvonz.github.io/jj/v0.13.0/tutorial/
+[jj-vevo]: https://docs.jj-vcs.dev/v0.13.0/tutorial/
 [github]: https://github.com/steveklabnik/jujutsu-tutorial