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/custom_assets.rs

@@ -1,7 +1,7 @@
 use dioxus::prelude::*;
 
 fn main() {
-    dioxus::desktop::launch(app);
+    dioxus_desktop::launch(app);
 }
 
 fn app(cx: Scope) -> Element {