Fix link to root page on the main page footer

lms/templates/footer.html

@@ -6,7 +6,7 @@
   <nav>
     <section class="top">
       <section class="primary">
-        <a href="https://www.edx.org" class="logo"></a>
+        <a href="${reverse('root')}" class="logo"></a>
         <a href="${reverse('courses')}">Find Courses</a>
         <a href="${reverse('about_edx')}">About</a>
         <a href="http://blog.edx.org/">Blog</a>