initial static_controller and index page set up ch4
Added bootstrap- ch5
Self - Added bootstrap Nav - ch6
Minor enhancements in Navbar  - ch7
Setting up HERO and overlay FROSTY text  - ch8
Minor enhancements on landing page  - ch9
Enableed Devise and set up Devise views and User  - ch10
Enabled user login signup links etc  - ch10.2
Added a sticky footer  - ch11
Intial course creation workflow - ch 12
Added basic validation to Course creation form - ch 13
Create public course listing - ch 14
Student view - Course Details - ch 15
Building out Course sections - ch 16
Building Lessons and connect to Sections - ch 17
Enable permission on Lessons and code refactoring - ch 18
Enable permission on instructor pages and refactor - ch 19
Course details page  and refactor - ch 20
Set up image upload on Course and S3 - ch 21
Enabling Image re-sizing using minimagick gem - ch 22