update classic demo to work with v5.0.1. that was horrid.

Author: Birch-san

demo/classic/.gitignore

@@ -1,3 +1,4 @@
 /node_modules/
-/public/Box2D.js
-/public/Box2D.wasm
+/public/wasm-feature-detect.js
+/public/entry.js
+/public/build/

demo/classic/README.md

@@ -6,13 +6,17 @@ This package shows how you could install `box2d-wasm` into a webpage, using old-
 
 ## Setup
 
-Grab yourself a copy of this repository, install the demo's dependencies with npm, and copy `Box2D.js` & `Box2D.wasm` into `public`, where the demo will be served from:
+Grab yourself a copy of this repository, install the demo's dependencies with npm, and copy the following files into `public`, where the demo will be served from:
 
 ```bash
 git clone https://github.com/Birch-san/box2d-wasm.git
 cd box2d-wasm/demo/classic
 npm ci
-cp node_modules/box2d-wasm/build/umd/Box2D.{js,wasm} public
+mkdir -p public/build/flavour/{simd,standard}/umd
+cp node_modules/wasm-feature-detect/dist/umd/index.js public/wasm-feature-detect.js
+cp node_modules/box2d-wasm/entry/umd/entry.js public
+cp node_modules/box2d-wasm/build/flavour/simd/umd/Box2D.simd.{js,wasm} public/build/flavour/simd/umd
+cp node_modules/box2d-wasm/build/flavour/standard/umd/Box2D.{js,wasm} public/build/flavour/standard/umd
 ```
 
 ## Run

demo/classic/package-lock.json

@@ -9,6 +9,6 @@
     "sirv-cli": "^1.0.0"
   },
   "dependencies": {
-    "box2d-wasm": "4.0.0"
+    "box2d-wasm": "5.0.1"
   }
 }

demo/classic/package.json

@@ -16,7 +16,8 @@
     }
   </style>
 
-  <script src='Box2D.js'></script>
+  <script src='wasm-feature-detect.js'></script>
+  <script src='entry.js'></script>
   <script src='demo.js'></script>
 </head>