Improving layouts

_includes/main_title.html

+<h1 class="maintitle"><a href="{{ site.root }}/">{{ site.title }}</a>{% if page.title %}: {{ page.title }}{% endif %}</h1>

_layouts/index.html

 ---
 layout: base
 ---
-<h1 class="maintitle">{{ site.title }}</h1>
+{% include main_title.html %}
 {{ content }}

_layouts/page.html

 ---
 layout: base
 ---
-<h1 class="maintitle"><a href="{{ site.root }}/">{{ site.title }}</a>: {{ page.title }}</h1>
+{% include main_title.html %}
 {{content}}

_layouts/reference.html

 ---
-layout: base
-title: Reference
+layout: page
 permalink: /reference/
 ---
 {% include all_keypoints.html %}