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 https://github.com/ihor-bobyr/programming.org.ua/issues/1 feedbacks slider
• [x] try to reuse https://github.com/ihor-bobyr/programming.org.ua/issues/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
• [x] create get a job section
• [x] create diploma section
• [x] create mentors section