remove preview button
fixing responsive layout from new lesson page
add margin-bottom to .search-filters (fixes #467)
remove workload section from course page
remove go to course button from materials page (refs #455)
fix question page (closes #466)
fix user photo on profile page
fix user photo on profile page
fix upload avatar button on edit profile page
fix responsive issues on edit profile page
fix responsive issues on course notes page
fix responsive issues on course header
fix responsive issues on my notes page
hide users and statistics links from admin
change page title tag
fix courses page link on navbar
courses page template
fix courses info
fix course abstract
courses page filters