updates favicons to support dark mode (#1185)

Author: skim

static/images/favicon-16x16.png

@@ -35,11 +35,11 @@
 
     <!-- favicon -->
     <link rel="apple-touch-icon" sizes="180x180" href="/static/images/apple-touch-icon.png?v=ngJW8jGAmR">
-    <link rel="icon" type="image/png" sizes="32x32" href="/static/images/favicon-32x32.png?v=ngJW8jGAmR">
-    <link rel="icon" type="image/png" sizes="16x16" href="/static/images/favicon-16x16.png?v=ngJW8jGAmR">
+    <link rel="alternate icon" type="image/png" href="/static/images/favicon-16x16.png">
+    <link rel="alternate icon" type="image/png" href="/static/images/favicon-32x32.png">
+    <link rel="icon" type="image/svg+xml" href="/static/images/favicon.svg">
     <link rel="manifest" href="/static/images/site.webmanifest?v=ngJW8jGAmR">
     <link rel="mask-icon" href="/static/images/safari-pinned-tab.svg?v=ngJW8jGAmR" color="#000000">
-    <link rel="shortcut icon" href="/static/images/favicon.ico?v=ngJW8jGAmR">
     <meta name="msapplication-TileColor" content="#ffffff">
     <meta name="msapplication-config" content="/static/images/browserconfig.xml?v=ngJW8jGAmR">
     <meta name="theme-color" content="#ffffff">