adjust html title

Author: transpute

_includes/head.html

@@ -3,7 +3,7 @@
     <meta name="viewport" content="width=device-width">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
 
-    <title>{% if page.title %}{{ page.title }}{% else %}{{ site.title }}{% endif %}</title>
+    <title>{% if page.title %}{{ site.title }} - {{ page.title }}{% else %}{{ site.title }}{% endif %}</title>
     <meta name="description" content="{{ site.description }}">
 
     <link rel="stylesheet" href="{{ "/css/main.css" | prepend: site.baseurl }}">