Re-add empty author sidebar to fix aligment

Prior to #863, an article-author-side sidebar ensured the main content
was centered. This commit reintroduces that (empty) sidebar
to fix the layout.

Author: stickies-v

_layouts/home.html

@@ -29,6 +29,7 @@
 {% endif %}
 
 <div id="main" role="main">
+  <div class="article-author-side">&nbsp;</div>
   <div id="index">
     {% assign navigation = site.data.navigation[page.lang] %}
     <h3><a href="{{ navigation.blog.url }}">Recent Posts</a></h3>

_layouts/page.html

@@ -29,6 +29,7 @@
 {% endif %}
 
 <div id="main" role="main">
+  <div class="article-author-side">&nbsp;</div>
   <article class="page">
     <h1>{{ page.title | xml_escape }}</h1>
     <div class="article-wrap">

_layouts/post-index.html

@@ -29,6 +29,7 @@
 {% endif %}
 
 <div id="main" role="main">
+  <div class="article-author-side">&nbsp;</div>
   <div id="index">
     <h1>{{ page.title | xml_escape }}</h1>
     {% capture written_year %}'None'{% endcapture %}

_layouts/post.html

@@ -29,6 +29,7 @@
 {% endif %}
 
 <div id="main" role="main">
+  <div class="article-author-side">&nbsp;</div>
   <article class="post h-entry">
     <div class="headline-wrap">
       {% if page.link %}