Make handler arguments optional (#87)

* feat: support axum extractors

* chore: update tuono example

* chore: update tutorial example

* doc: update documentation

* feat: update version to v0.12.0

* fix: use clippy suggestion

examples/tutorial/src/routes/pokemons/GOAT.rs

@@ -1,7 +1,7 @@
 // src/routes/pokemons/GOAT.rs
-use tuono_lib::{reqwest::Client, Request, Response};
+use tuono_lib::{Request, Response};
 
 #[tuono_lib::handler]
-async fn redirect_to_goat(_: Request, _: Client) -> Response {
+async fn redirect_to_goat(_req: Request) -> Response {
     Response::Redirect("/pokemons/mewtwo".to_string())
 }