HTML Textbooks: Adding annotation css files group

lms/templates/notes.html

@@ -3,6 +3,7 @@
 <%namespace name='static' file='static_content.html'/>
 ${static.css(group='style-vendor-tinymce-content', raw=True)}
 ${static.css(group='style-vendor-tinymce-skin', raw=True)}
+${static.css(group='style-xmodule-annotations', raw=True)}
 <script type="text/javascript" src="${static.url('js/vendor/tinymce/js/tinymce/tinymce.full.min.js', raw=True)}"></script>
  <script type="text/javascript" src="${static.url('js/vendor/tinymce/js/tinymce/jquery.tinymce.min.js', raw=True)}" ></script>
 <%inherit file="main.html" />