Add password change discovery

See https://web.dev/change-password-url/

crates/handlers/src/lib.rs

@@ -60,6 +60,10 @@ where
 {
     // All those routes are API-like, with a common CORS layer
     let api_router = Router::new()
+        .route(
+            mas_router::ChangePasswordDiscovery::route(),
+            get(|| async { mas_router::AccountPassword.go() }),
+        )
         .route(
             mas_router::OidcConfiguration::route(),
             get(self::oauth2::discovery::get),