Remove AU branding

Rename the app from "AU Whisper Web" to "Whisper Web" in the README
title and app header, rename the package to whisper_web, and drop the
au_ prefix from the transformers patch comment and the scratch path in
isolate_wer2.ts.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/App.tsx

@@ -1004,7 +1004,7 @@ export function App() {
     <main className="app">
       <header className="app-header">
         <div>
-          <h1>AU Whisper Web</h1>
+          <h1>Whisper Web</h1>
           <p className="tagline">
             Speech-to-text that runs entirely in your browser. Your audio never
             leaves this device.