Fix the courses not outputing in newer Jekyll
Fix the courses not outputing in newer Jekyll

acgd-learn-the-web/www,acgd-learn-the-web/www,acgd-learn-the-web/acgd-learn-the-web.github.io,acgd-learn-the-web/acgd-learn-the-web.github.io,acgd-learn-the-web/www,acgd-learn-the-web/www,acgd-learn-the-web/www