Simplify jinja2 base templates, update theme options

- New realfavicongenerator.net packages (https://realfavicongenerator.net/blog/new-favicon-package-less-is-more/)
- Support all possible Pelican feed links
- Add recommended HEAD elements (https://github.com/joshbuchea/HEAD)
- Use minified css assets
- Link to boostrap, clean-blog and font-awesome stylesheets
- Add theme options, better options names

Template consistency, update structure on base.html

Fix missing article summary on index.html

Show the article.summary for teasers

alchemy/templates/index.html

@@ -1,44 +1,36 @@
 {% extends "base.html" %}
 
 {% block head %}
-  {{ super() }}
-  <meta name="author" content="{{ AUTHOR }}">
-  <meta name="description" content="{{ META_DESCRIPTION|striptags }}">
+{{ super() }}
+<meta name="description" content="{{ SITE_DESCRIPTION|striptags }}">
+{% endblock %}
+
+{% block title %}
+{{ SITENAME }} &mdash; {{ SITE_TAGLINE }}
+{% endblock %}
+
+{% block page_header %}
+All Articles
 {% endblock %}
 
 {% block content %}
-  {% block page_title %}
-    <h1>All Articles</h1>
-  {% endblock %}
-  <div>
-    {% for article in articles_page.object_list %}
-      <div class="post mini-post">
-        <div class="row">
-          <div class="col-md-4">
-            <p class="post-date">
-              <a class="text-muted" href="/{{ article.url }}" title="{{ article.date.isoformat() }}">{{ article.locale_date }}</a>
-            </p>
-            <p class="post-category">
-              <a href="{{ SITEURL }}/{{ article.category.url }}">{{ article.category }}</a>
-            </p>
-            {% if article.author and SHOW_ARTICLE_AUTHOR %}
-              <address class="post-author">
-                By <a href="{{ SITEURL }}/{{ article.author.url }}">{{ article.author }}</a>
-              </address>
-            {% endif %}
-          </div>
-          <div class="col-md-8">
-            <h2 class="post-title">
-              <a href="/{{ article.url }}" title="Permalink to {{ article.title|striptags }}">{{ article.title }}</a>
-            </h2>
-            <div class="post-content">
-              {{ article.content|striptags|truncate(256) }}
-            </div>
-          </div>
-        </div>
-      </div>
-    {% endfor %}
+{% for article in articles_page.object_list %}
+<div class="teaser">
+  <div class="row">
+    <div class="col-sm-4 hidden-xs teaser-header">
+      <div class="text-muted teaser-date" title="{{ article.date.isoformat() }}">{{ article.locale_date }}</div>
+      <div><a href="{{ SITEURL }}/{{ article.category.url }}">{{ article.category }}</a></div>
+      {% if article.author and SHOW_ARTICLE_AUTHOR %}
+      <div>By <a href="{{ SITEURL }}/{{ article.author.url }}">{{ article.author }}</a></div>
+      {% endif %}
+    </div>
+    <div class="col-sm-8 teaser-main">
+      <h2><a href="/{{ article.url }}" title="Permalink to {{ article.title|striptags }}">{{ article.title }}</a></h2>
+      <p>{{ article.summary }}</p>
+    </div>
   </div>
-  {% include 'include/pagination.html' %}
 </div>
+<hr>
+{% endfor %}
+{% include 'include/pagination.html' %}
 {% endblock %}