Fix the blog page title (#331)

_includes/head.html

@@ -2,7 +2,16 @@
 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 
-<title>{% if site.title == "blank" %}{{ site.first_name }} {{ site.middle_name }} {{ site.last_name }}{% else %}{{ site.title }}{% endif %}{% if page.title and page.url != "/" %} | {{ page.title }}{% endif %}</title>
+<title>
+{% if site.title == "blank" %}
+  {{ site.first_name }} {{ site.middle_name }} {{ site.last_name }}
+{% else %}
+  {{ site.title }}
+{% endif %}
+{% if page.title != "blank" and page.url != "/" %}
+  | {{ page.title }}
+{% endif %}
+</title>
 <meta name="description" content="{{ site.description }}">
 
 <!-- Open Graph -->

blog/index.html

@@ -1,5 +1,6 @@
 ---
 layout: default
+title: blog
 pagination:
   enabled: true
   collection: posts