chore(examples): rename hello_sound to simple_audio and fix the links in the README

examples/hello_sound.rs

@@ -1,26 +0,0 @@
-use comet::prelude::*;
-use comet_sound::Audio;
-
-fn setup(app: &mut App, _renderer: &mut Renderer2D) {
-    app.load_audio("startup", "res/sounds/hit.ogg");
-    app.play_audio("startup", true); // second parameter loops the sound
-
-    // here the float indicated the volume percentage
-    // in the standard backend for audio in comet (kira) 0.0 is equal to -20dB and 1.0 to 0dB
-    app.set_volume("startup", 1.0);
-}
-
-#[allow(unused_variables)]
-fn update(app: &mut App, renderer: &mut Renderer2D, dt: f32) {
-    // in this example, update_audio doesnt do anything because the kira audio system
-    // doesnt need any update
-    app.update_audio(dt);
-}
-
-fn main() {
-    App::new()
-        .with_title("Comet Audio Example")
-        // This can be used to add your own sound engine to the engine
-        .with_audio(Box::new(comet_sound::KiraAudio::new())) // to
-        .run::<Renderer2D>(setup, update);
-}