Deprecate bulma in favor of normalize and milligram

Deprecate the bulma css framework in favor of normalize and
milligram. Adapt the templates to work with the new css libraries.

templates/page.html

@@ -1,23 +1,33 @@
 {% extends "base.html" %}
 
 {% block title %}
-{% set section = get_section(path=page.ancestors | last) %}
-{{ config.title }} - {{ section.title }} - {{ page.title }}: {{ page.date }}
+{% if page.ancestors %}
+{% set ancestor = get_section(path=page.ancestors | last) %}
+{% if ancestor.extra %}
+{{ config.title }} | {{ page.date }} - {{ page.title }} ({{ ancestor.title }})
+{% else %}
+{{ config.title }} | {{ page.title }}
+{% endif %}
+{% endif %}
 {% endblock title %}
 
+{% block subtitle %}
+{% if page.ancestors %}
+{% set ancestor = get_section(path=page.ancestors | last) %}
+{% if ancestor.extra %}
+<h2>{{ ancestor.extra.start }} - {{ ancestor.extra.end }}: {{ ancestor.title }}</h2>
+{% else %}
+<h2>{{ page.title }}</h2>
+{% endif %}
+{% endif %}
+{% endblock subtitle %}
+
 {% block content %}
-{% set section = get_section(path=page.ancestors | last) %}
-<h1 class="title">{{ config.title }}</h1>
-<h2 class="subtitle">{{ section.title }}</h2>
-{% include "navbar.html" %}
-<h3 class="subtitle">{{ page.title }} ({{ page.date }})</h3>
-<div class="content">
-  <div class="block">
-    {{ page.content | safe }}
-  </div>
-  <div class="block">
-    {% include "comments.html" %}
-  </div>
-</div>
-{% include "navbar.html" %}
+{% if page.date %}
+<h3>{{ page.title }} ({{ page.date }})</h3>
+{% endif %}
+{{ page.content | safe }}
+{% if page.date %}
+{% include "comments.html" %}
+{% endif %}
 {% endblock content %}