chore: add robots.txt, link to favicon

Author: battlesquid

packages/app/index.html

@@ -12,6 +12,7 @@
     <meta property="og:image" content="/og_banner.png">
     <meta property="og:description" content="Your Contribution Story in 3D. Create, edit, and share 3D models of your yearly contributions on Github Skyline.">
     <meta name="twitter:card" content="summary_large_image"></meta>
+    <link rel="icon" type="image/x-icon" href="/favicon.ico">
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link

packages/app/public/robots.txt

@@ -0,0 +1,2 @@
+User-Agent: *
+Disallow: