Drop the extra canonical tag from the app page

The server already sends a canonical header for this page.

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

index.html

@@ -5,7 +5,6 @@
     <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover" />
     <title>Ava</title>
     <meta name="description" content="Talk face to face with LFM3-Omni, running in your browser" />
-    <link rel="canonical" href="https://townbox-ava.static.hf.space/index.html" />
     <meta property="og:type" content="website" />
     <meta property="og:site_name" content="Hugging Face Spaces" />
     <meta property="og:url" content="https://townbox-ava.static.hf.space/index.html" />