Add webassets project

Webassets enables SCSS compilation and asset minification
The pelican-assets plugin was added to integrate it into Pelican
diff --git a/templates/base.html b/templates/base.html
index de81270..3123615 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -2,21 +2,16 @@
 <html lang="{{ DEFAULT_LANG }}">
 
 <head>
-  {% if SERVER_LESS %}
-  <link rel="stylesheet" type="text/css" href="{{ SITEURL }}/theme/css/style.css">
-  {% else %}
-  <link rel="stylesheet/less" type="text/css" href="{{ SITEURL }}/theme/css/style.less">
-  <script src="//cdnjs.cloudflare.com/ajax/libs/less.js/2.2.0/less.min.js" type="text/javascript"></script>
-  {% endif %}
-
-  <link rel="stylesheet" type="text/css" href="{{ SITEURL }}/theme/css/pygments.css">
-  <link href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet">
-
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <meta name="author" content="{{ AUTHOR }}">
   <meta name="description" content="{% block description %}Posts by {{ AUTHOR }}{% endblock %}">
 
+  {% assets filters="libsass,cssmin", output="css/style.min.css", "css/style.scss", "css/pygments.css" %}
+  <link rel="stylesheet" type="text/css" href="{{ SITEURL }}/{{ ASSET_URL }}">
+  {% endassets %}
+  <link href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet">
+
   {% if FEED_ALL_ATOM %}
   <link href="{{ FEED_DOMAIN }}/{{ FEED_ALL_ATOM }}" type="application/atom+xml" rel="alternate" title="{{ SITENAME }} Full Atom Feed" />
   {% endif %}