Update /courses fwd/back links to be more consistent

Teachers, click here! is bit bigger.

app/styles/courses/courses-view.sass

@@ -1,29 +1,29 @@
 #courses-view
-  #site-content-area
+  #main-content
     padding-left: 250px
     padding-right: 250px
-    
+
   h1
     margin-bottom: 30px
-    
+
   #play-now-to-learn-header
     margin-top: 60px
-    
+
   ul
     margin: 0 auto 40px
     width: 320px
-    
+
   #begin-hoc-area
     width: 50%
     margin: 0 auto
-    
+
   hr
     border-top: 1px solid grey
     margin: 5px 0
 
   .text-uppercase
     margin-top: 40px
-    
+
   #just-added-text
     color: #009999
 
@@ -31,20 +31,20 @@
     border: 1px solid #009999
     margin: 0 -20px
     padding: 0 20px
-    
+
   h3
     margin-top: 20px
-    
+
   .course-instance-entry
     padding-left: 40px
-    
+
     .progress-bar
       min-width: 15%
 
     .btn
       margin-left: 20px
       min-width: 180px
-      
+
   #join-class-form
     .alert, .progress
-      margin-top: 20px
+      margin-top: 20px

app/templates/courses/course-details.jade

@@ -1,13 +1,13 @@
 extends /templates/base
 
 block content
-  
-  h2
-    if view.teacherMode
-      a(href="/courses/teachers") Back to my classrooms
-    else
-      a(href="/courses") Back to my courses
-  hr
+
+  if view.teacherMode
+    a(href="/courses/teachers") Back to my classrooms
+  else
+    a(href="/courses") Back to my courses
+  br
+  br
 
   if (noCourseInstance || noCourseInstanceSelected) && course
     h1= course.get('name')

app/templates/courses/courses-view.jade

@@ -1,12 +1,11 @@
 extends /templates/base
 
 block content
-  .pull-right
+  h3.text-right
     if me.isAnonymous()
       a(href="/teachers") Teachers, click here!
     else
       a(href="/courses/teachers") Teachers, click here!
-  br
 
   #main-content
     if me.isAnonymous()