get Svelte/rollup example working with v5.0.2

Author: Birch-san

demo/svelte-rollup-ts/.gitignore

@@ -1,3 +1,4 @@
 /node_modules/
 /public/build/
-/public/Box2D.wasm
+/public/Box2D.wasm
+/public/Box2D.simd.wasm

demo/svelte-rollup-ts/README.md

@@ -28,11 +28,10 @@ Navigate to [localhost:4000](http://localhost:4000).
 
 ## Bundle for production
 
-Build a production bundle into `public/build`, copy `Box2D.wasm` into `public` too:
+Build a production bundle into `public/build`:
 
 ```bash
 npm run build
-cp node_modules/box2d-wasm/build/es/Box2D.wasm public
 ```
 
 ## Verify the production bundle