onboarding: Add the AI page (#35351)

This PR starts the work on the AI onboarding page as well as the
configuration modal

Release Notes:

- N/A

---------

Co-authored-by: Danilo Leal <daniloleal09@gmail.com>
Co-authored-by: Anthony <anthony@zed.dev>

crates/ui/src/components.rs

@@ -1,4 +1,5 @@
 mod avatar;
+mod badge;
 mod banner;
 mod button;
 mod callout;
@@ -41,6 +42,7 @@ mod tooltip;
 mod stories;
 
 pub use avatar::*;
+pub use badge::*;
 pub use banner::*;
 pub use button::*;
 pub use callout::*;