Added lesson list controller
Added lesson list and add action
Merge branch 'master' of https://github.com/groomycian/nouscourse into feature/add-lessons-admin-pages
edit and destroy action for lessons
Merge branch 'feature/add-lessons-admin-pages' into develop
Merge branch 'release/add-lessons-page'
Added buttons to remove all lessons/courses
Merge branch 'release/added-buttons-to-remove-all-lessons-courses'
Added timetable list to show on the lessons page