Fix favicons (#3278)

* Fix favicons

* Remove unused static resources

* Revert air_gapped

Author: reakaleek

resources/web/template.html

@@ -6,19 +6,9 @@
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <script src="https://cdn.optimizely.com/js/18132920325.js"></script>
-    <link rel="apple-touch-icon" sizes="57x57" href="/apple-icon-57x57.png">
-    <link rel="apple-touch-icon" sizes="60x60" href="/apple-icon-60x60.png">
-    <link rel="apple-touch-icon" sizes="72x72" href="/apple-icon-72x72.png">
-    <link rel="apple-touch-icon" sizes="76x76" href="/apple-icon-76x76.png">
-    <link rel="apple-touch-icon" sizes="114x114" href="/apple-icon-114x114.png">
-    <link rel="apple-touch-icon" sizes="120x120" href="/apple-icon-120x120.png">
-    <link rel="apple-touch-icon" sizes="144x144" href="/apple-icon-144x144.png">
-    <link rel="apple-touch-icon" sizes="152x152" href="/apple-icon-152x152.png">
-    <link rel="apple-touch-icon" sizes="180x180" href="/apple-icon-180x180.png">
-    <link rel="icon" type="image/png" href="/favicon-32x32.png" sizes="32x32">
-    <link rel="icon" type="image/png" href="/android-chrome-192x192.png" sizes="192x192">
-    <link rel="icon" type="image/png" href="/favicon-96x96.png" sizes="96x96">
-    <link rel="icon" type="image/png" href="/favicon-16x16.png" sizes="16x16">
+    <link rel="icon" href="/favicon.ico" sizes="32x32"/>
+    <link rel="icon" href="/favicon.svg" type="image/svg+xml"/>
+    <link rel="apple-touch-icon" href="/apple-touch-icon.png" sizes="180x180"/>
     <link rel="manifest" href="/manifest.json">
     <meta name="apple-mobile-web-app-title" content="Elastic">
     <meta name="application-name" content="Elastic">
@@ -32,11 +22,6 @@
     <meta property="og:image" content="https://static-www.elastic.co/v3/assets/bltefdd0b53724fa2ce/blt280217a63b82a734/6202d3378b1f312528798412/elastic-logo.svg" />
     <meta property="og:image:width" content="500" />
     <meta property="og:image:height" content="172" />
-    <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon">
-    <link rel="icon" href="/favicon.ico" type="image/x-icon">
-    <link rel="apple-touch-icon-precomposed" sizes="64x64" href="/favicon_64x64_16bit.png">
-    <link rel="apple-touch-icon-precomposed" sizes="32x32" href="/favicon_32x32.png">
-    <link rel="apple-touch-icon-precomposed" sizes="16x16" href="/favicon_16x16.png">
     <!-- Give IE8 a fighting chance -->
     <!--[if lt IE 9]>
     <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>