Allow Open Sans to be used when testing locally

When a web font's URL is specified via `href="//<host>"`, the protocol
is inherited from the loaded page. That's all good and fine if `https`
(or even `http`) is used to load the page, but falls apart when the
protocol is `file`, as it is the case when testing locally.

Therefore, let's just use `https` instead. This should be used nowadays
instead of `http`, anyways.

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

Author: dscho

layouts/_default/baseof.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">
 		{{- $style := resources.Get "sass/pack.css" | resources.ExecuteAsTemplate "pack.css" . | css.Sass }}
 		<link rel="stylesheet" href="{{ $style.RelPermalink }}">
 		<style type="text/css">