refactor: refactored the course page

- simplified the portal page for course
- added mentods to LMS Course and Community Member to reduce custom code
  in portal pages
- included lessons in the ChapterTeaser

community/www/macros/common_macro.html

@@ -2,7 +2,7 @@
 <h3>Instructor</h3>
 <div class="instructor">
     <div class="instructor-title">{{instructor.full_name}}</div>
-    <div class="instructor-subtitle">Created {{instructor.course_count}} courses</div>
+    <div class="instructor-subtitle">Created {{instructor.get_course_count()}} courses</div>
 </div>
 {% endmacro %}
 
@@ -11,7 +11,7 @@
 {% for m in mentors %}
 <div class="instructor">
     <div class="instructor-title">{{m.full_name}}</div>
-    <div class="instructor-subtitle">Mentored {{m.batch_count}} batches</div>
+    <div class="instructor-subtitle">Mentored {{m.get_batch_count()}} batches</div>
 </div>
 {% endfor %}
 {% if not is_mentor %}
@@ -29,4 +29,4 @@
 	<h3>{{course_name}}</h3>
 	<div class="text-muted">{{member_count}} members</div>
 </div>
-{% endmacro %}
+{% endmacro %}