Fix no-protocol link

Pointed out by

	https://sonarwhal.com/scanner/d242229a-bc2e-4f5c-b427-23272f1ef048

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

index.html

@@ -6,7 +6,7 @@
 		<title>Git for Windows</title>
 		<meta name="description" content="We bring the awesome Git VCS to Windows">
 		<meta name="viewport" content="width=device-width, initial-scale=1">
-		<link rel="stylesheet" href="//fonts.googleapis.com/css?family=Open+Sans:300,400,700">
+		<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,400,700">
 		<link rel="stylesheet" href="css/pack.css">
 		<link rel="shortcut icon" href="favicon.ico">
 		<!--[if lt IE 9]>