Renderers are now packages, not features. (#387)

* feat: use synchronous router design

* feat: function to get router out of dom

* chore: restructure workspace to use renderers as packages, not features

examples/rsx_usage.rs

@@ -39,7 +39,7 @@
 //! - Allow top-level fragments
 //!
 fn main() {
-    dioxus::desktop::launch(app);
+    dioxus_desktop::launch(app);
 }
 
 /// When trying to return "nothing" to Dioxus, you'll need to specify the type parameter or Rust will be sad.