Less clumsy configuration for desktop and mobile (#553)

* chore: dont use prebuilt builder pattern for configuring desktop

* chore: use regular config pattern for web

* Chore: update docs too

* chore: clean up some warnings

examples/calculator.rs

@@ -6,16 +6,16 @@ This calculator version uses React-style state management. All state is held as
 use dioxus::events::*;
 use dioxus::html::input_data::keyboard_types::Key;
 use dioxus::prelude::*;
+use dioxus_desktop::{Config, WindowBuilder};
 
 fn main() {
-    use dioxus_desktop::tao::dpi::LogicalSize;
-    dioxus_desktop::launch_cfg(app, |cfg| {
-        cfg.with_window(|w| {
-            w.with_title("Calculator Demo")
-                .with_resizable(false)
-                .with_inner_size(LogicalSize::new(320.0, 530.0))
-        })
-    });
+    let config = Config::new().with_window(
+        WindowBuilder::default()
+            .with_title("Calculator")
+            .with_inner_size(dioxus_desktop::LogicalSize::new(300.0, 500.0)),
+    );
+
+    dioxus_desktop::launch_cfg(app, config);
 }
 
 fn app(cx: Scope) -> Element {