create adult courses page

[ihor-bobyr]

create https://programming.org.ua/en/courses/adults
https://github.com/shpp/programming.org.ua/tree/master/src/pages/adults-courses-page

• try to reuse implement english index page #1 feedbacks slider
• try to reuse implement english index page #1 manifesto summary items for popular questions section
• create banner section
• create a sign up section
• create education program section
• create format p2p section with slider
• create get a job section
• create diploma section
• create mentors section