Move repeated details to variables _config.yml and general cleanup

blog/atom.xml

@@ -1,22 +1,23 @@
 ---
 layout: null
 ---
+{% include base.html %}
 <?xml version="1.0" encoding="utf-8"?>
 <feed xmlns="http://www.w3.org/2005/Atom">
-   <id>http://dpb587.me/</id>
-   <title>Danny Berger</title>
-   <link href="http://dpb587.me/blog/atom.xml" rel="self"/>
-   <link href="http://dpb587.me/"/>
+   <id>{{ site.baseurl }}/</id>
+   <title>{{ site.author }}</title>
+   <link href="{{ site.absolute }}/blog/atom.xml" rel="self"/>
+   <link href="{{ site.absolute }}/"/>
    <updated>{{ site.time|date_to_xmlschema }}</updated>
    <author>
-       <name>Danny Berger</name>
-       <email>dpb587@gmail.com</email>
+       <name>{{ site.author }}</name>
+       <email>{{ site.email }}</email>
    </author>
    {% for post in site.posts %}
        <entry>
-           <id>http://dpb587.me{{ post.id }}</id>
+           <id>{{ site.absolute }}/{{ post.id }}</id>
            <title>{{ post.title }}</title>
-           <link href="http://dpb587.me{{ post.url }}"/>
+           <link href="{{ site.absolute }}{{ post.url }}"/>
            <updated>{{ post.date|date_to_xmlschema }}</updated>
            <content type="html">{{ post.content|xml_escape }}</content>
        </entry>

blog/index.html

@@ -2,7 +2,6 @@
 title: Blog Summary
 layout: default
 ---
-
 {% for post in site.posts %}
     <section>
         <header>