Course limit on homepage and course order

Trello Card: https://trello.com/c/b6Kd3qg4

 - Limit courses to only 9 on homepage: https://bitbucket.org/Edraak/edraak-theme/commits/3e511987b921c7546bdfecd78b4e7261869bec0e
 - Hide unpublished courses from the homepage