refacto: nest axum templates routes

crates/app/src/templates/mod.rs

@@ -1,2 +1,8 @@
-pub mod hello;
-pub mod index;
+use axum::Router;
+
+mod hello;
+
+pub fn get_routes() -> Router {
+    Router::new()
+        .nest("/hello", hello::get_routes())
+}