_content: add high-res favicon

Fixes golang/go#57899

Change-Id: I66d6477f7d595229443b45230202957193114047
Reviewed-on: https://go-review.googlesource.com/c/website/+/476975
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/_content/images/favicon-gopher-plain.png b/_content/images/favicon-gopher-plain.png
new file mode 100644
index 0000000..f3abae7
--- /dev/null
+++ b/_content/images/favicon-gopher-plain.png
Binary files differ
diff --git a/_content/images/favicon-gopher.png b/_content/images/favicon-gopher.png
new file mode 100644
index 0000000..be49a87
--- /dev/null
+++ b/_content/images/favicon-gopher.png
Binary files differ
diff --git a/_content/images/favicon-gopher.svg b/_content/images/favicon-gopher.svg
new file mode 100644
index 0000000..e5a68fe
--- /dev/null
+++ b/_content/images/favicon-gopher.svg
@@ -0,0 +1,238 @@
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+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
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diff --git a/_content/site.tmpl b/_content/site.tmpl
index 52ff568..2b3f59f 100644
--- a/_content/site.tmpl
+++ b/_content/site.tmpl
@@ -15,6 +15,9 @@
 <meta name="theme-color" content="#00add8">
 <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Material+Icons">
 <link rel="stylesheet" href="/css/styles.css">
+<link rel="icon" href="/images/favicon-gopher.png" sizes="any">
+<link rel="apple-touch-icon" href="/images/favicon-gopher-plain.png"/>
+<link rel="icon" href="/images/favicon-gopher.svg" type="image/svg+xml">
 {{if strings.HasPrefix .URL "/blog/"}}
 <link rel="alternate" title="The Go Blog" type="application/atom+xml" href="/blog/feed.atom">
 {{end}}
diff --git a/_content/tour/template/index.tmpl b/_content/tour/template/index.tmpl
index 51b1dcf..e72ce27 100755
--- a/_content/tour/template/index.tmpl
+++ b/_content/tour/template/index.tmpl
@@ -7,10 +7,12 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
     <meta name="apple-mobile-web-app-capable" content="yes">
     <meta name="mobile-web-app-capable" content="yes">
-    <link rel="shortcut icon" sizes="196x196" href="/favicon.ico">
     <link rel="stylesheet" href="/tour/static/css/app.css" />
     <link rel="stylesheet" href="/tour/static/lib/codemirror/lib/codemirror.css">
     <link href='https://fonts.googleapis.com/css?family=Inconsolata' rel='stylesheet' type='text/css'>
+    <link rel="icon" href="/images/favicon-gopher.png" sizes="any">
+    <link rel="apple-touch-icon" href="/images/favicon-gopher-plain.png"/>
+    <link rel="icon" href="/images/favicon-gopher.svg" type="image/svg+xml">
 </head>
 
 <body>