Implement error pages. Fixes #21

templates/404.html

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+{% extends 'base_fullwidth.html' %}
+
+{% block sectiontitle %}Four Oh Four{% endblock %}
+
+{% block title %} 404 - Page not found!{% endblock %}
+
+{% block content %}
+<div class="item">
+The page you were looking for could not be found.
+</div>
+{% endblock %}

templates/500.html

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+{% extends 'base_fullwidth.html' %}
+
+{% block sectiontitle %}Kamikaze Shrubs{% endblock %}
+
+{% block title %} 500 - Server Error{% endblock %}
+
+{% block content %}
+<div class="item">
+The server crashed. Something bad happened. The admins have been notified. Please try to stay calm.
+</div>
+{% endblock %}