Updating favicon support to latest standards

Author: t0p0lin0

_layouts/default.html

@@ -7,7 +7,12 @@
   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1.0, user-scalable=no">
   <meta name="theme-color" content="#F7941D">
-  <link rel="icon" type="image/png" href="/img/logo.png"/>
+
+  <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
+  <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
+  <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
+  <link rel="manifest" href="/manifest.json">
+  <link rel="mask-icon" href="/safari-pinned-tab.svg" color="#5bbad5">
 
   <meta property="og:title" content="{{ site.title }}">
   <meta property="og:type" content="website">

android-chrome-192x192.png

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<browserconfig>
+    <msapplication>
+        <tile>
+            <square150x150logo src="/mstile-150x150.png"/>
+            <TileColor>#2b5797</TileColor>
+        </tile>
+    </msapplication>
+</browserconfig>

android-chrome-256x256.png

@@ -0,0 +1,18 @@
+{
+    "name": "",
+    "icons": [
+        {
+            "src": "/android-chrome-192x192.png",
+            "sizes": "192x192",
+            "type": "image/png"
+        },
+        {
+            "src": "/android-chrome-256x256.png",
+            "sizes": "256x256",
+            "type": "image/png"
+        }
+    ],
+    "theme_color": "#ffffff",
+    "background_color": "#ffffff",
+    "display": "standalone"
+}