move into gui folder for monorepo

gui/src/main.rs

@@ -0,0 +1,11 @@
+use mumble_web2_gui::app;
+
+pub fn main() {
+    #[cfg(feature = "desktop")]
+    let _guard = tokio::runtime::Builder::new_multi_thread()
+        .enable_all()
+        .build()
+        .unwrap()
+        .enter();
+    dioxus::launch(app::app);
+}