Chore: some cleanup and documentation

packages/web/examples/helloworld.rs

@@ -0,0 +1,11 @@
+use dioxus_web::prelude::*;
+
+fn main() {
+    wasm_bindgen_futures::spawn_local(dioxus_web::WebsysRenderer::start(App))
+}
+
+fn App(ctx: Context<()>) -> VNode {
+    ctx.render(rsx! {
+        div { "Hello, world!" }
+    })
+}