Simplify wasm compile steps a bit

Author: mit-mit

src/content/web/wasm.md

@@ -67,11 +67,7 @@ by following the temporary steps outlined here:
     which is necessary to run Wasm.
     Make sure your web apps are [migrated][] from `dart:html` to `package:web`.
 
-1. Compile with Wasm: `mywebapp$ dart compile wasm web/main.dart`
-
-1. Create a new directory for the built web app: `mkdir site`
-
-1. Copy over Dart code: `cp web/main.* site/`
+1. Compile with Wasm to a new `site` output directory: `mywebapp$ dart compile wasm web/main.dart -o site/main.wasm`
 
 1. Copy over the web files: `cp web/index.html web/styles.css site/`
 
@@ -89,4 +85,4 @@ You can also try out this small example [here](https://github.com/mit-mit/sandbo
 [`package:web`]: {{site.pub-pkg}}/web
 [`dart:js_interop`]: {{site.dart.api}}/{{site.dart.sdk.channel}}/dart-js_interop 
 [migrated]: /interop/js-interop/package-web/
-[dhttpd]: {{site.pub-pkg}}/dhttpd
+[dhttpd]: {{site.pub-pkg}}/dhttpd