Fix the router and stub out a number of crates to get compiling

examples/heavy_compute.rs

@@ -13,7 +13,7 @@ fn main() {
     dioxus_desktop::launch(app);
 }
 
-fn app(cx: Scope) -> Element {
+fn app() -> Element {
     // This is discouraged
     std::thread::sleep(std::time::Duration::from_millis(2_000));