Update favicon and add it for various platforms (scala#1092)

Author: Philippus

_includes/headertop.html

@@ -10,6 +10,13 @@
 
     <link rel="icon" type="image/png" href="{{ site.baseurl }}/resources/favicon.ico">
     <link rel="shortcut icon" type="image/png" href="{{ site.baseurl }}/resources/favicon.ico">
+    <link rel="apple-touch-icon" sizes="180x180" href="{{ site.baseurl }}/resources/apple-touch-icon.png">
+    <link rel="icon" type="image/png" sizes="32x32" href="{{ site.baseurl }}/resources/favicon-32x32.png">
+    <link rel="icon" type="image/png" sizes="16x16" href="{{ site.baseurl }}/resources/favicon-16x16.png">
+    <link rel="manifest" href="{{ site.baseurl }}/resources/site.webmanifest">
+    <link rel="mask-icon" href="{{ site.baseurl }}/resources/safari-pinned-tab.svg" color="#5bbad5">
+    <meta name="msapplication-TileColor" content="#15a9ce">
+    <meta name="theme-color" content="#ffffff">
 
     <link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous">
 

resources/android-chrome-192x192.png

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<browserconfig>
+    <msapplication>
+        <tile>
+            <square150x150logo src="/resources/mstile-150x150.png"/>
+            <TileColor>#2d89ef</TileColor>
+        </tile>
+    </msapplication>
+</browserconfig>

resources/android-chrome-512x512.png

@@ -0,0 +1,19 @@
+{
+    "name": "",
+    "short_name": "",
+    "icons": [
+        {
+            "src": "/resources/android-chrome-192x192.png",
+            "sizes": "192x192",
+            "type": "image/png"
+        },
+        {
+            "src": "/resources/android-chrome-512x512.png",
+            "sizes": "512x512",
+            "type": "image/png"
+        }
+    ],
+    "theme_color": "#ffffff",
+    "background_color": "#ffffff",
+    "display": "standalone"
+}