Hide leading dash on index page.

Author: ajalt

docs/_includes/head.html

@@ -3,7 +3,7 @@
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <meta name="description" content="{% if page.summary %}{{ page.summary | strip_html | strip_newlines | truncate: 160 }}{% endif %}">
 <meta name="keywords" content="{{page.tags}}{% if page.tags %}, {% endif %} {{page.keywords}}">
-<title>{{ page.title }} - {{ site.site_title }}</title>
+<title>{% if page.title %}{{ page.title }} - {% endif %}{{ site.site_title }}</title>
 <link rel="stylesheet" href="{{ "css/syntax.css" }}">
 
 <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">