Merge pull request #549 from ariasuni/use-better-favicon-ico

Use the favicon.ico used on other Rust websites and actually use it

Author: chriskrycho

static/images/favicon.ico

@@ -40,6 +40,7 @@
     <link rel="apple-touch-icon" sizes="180x180" href="/static/images/apple-touch-icon.png">
     <link rel="icon" type="image/png" sizes="32x32" href="/static/images/favicon-32x32.png">
     <link rel="icon" type="image/png" sizes="16x16" href="/static/images/favicon-16x16.png">
+    <link rel="shortcut icon" href="/static/images/favicon.ico">
     <link rel="manifest" href="/static/images/site.webmanifest">
     <link rel="mask-icon" href="/static/images/safari-pinned-tab.svg" color="#5bbad5">
     <meta name="msapplication-TileColor" content="#00aba9">