strand-cam: add favicon

Author: astraw

strand-cam/yew_frontend/index.html

@@ -6,6 +6,7 @@
   <title>Loading...</title>
   <link data-trunk rel="scss" href="scss/strand-cam-frontend.scss" />
   <link data-trunk rel="copy-file" href="src/strand-camera-no-text.png">
+  <link data-trunk rel="copy-file" href="src/favicon.ico" />
   <base data-trunk-public-url />
 </head>