markup tweaks to fix content crunching

cms/templates/course_info.html

@@ -33,15 +33,12 @@
   <div class="main-wrapper">
     <div class="inner-wrapper">
       <h1>Course Info</h1>
-      <div class="main-column">
-		<div class="unit-body window" id="course-update-view">
+      <article class="unit-body window" id="course-update-view">
         <h2>Updates</h2>
         <a href="#" class="new-update-button">New Update</a>
         <ol class="update-list" id="course-update-list"></ol>
         <!-- probably replace w/ a vertical where each element of the vertical is a separate update w/ a date and html field -->
-        </div>
-	  </div>
-	  <div class="sidebar window">
+      </article>
     </div>
   </div>
   </div>