Different dates and different buttons for hackathon and summer school in hero section

[aahnik]

Current state

what we need

• one button to join summer school (/register, which redirects to google forms)
• one button to join hackathon on devfolio (https://guide.devfolio.co/organizers/apply-with-devfolio-integration)
• think of proper text on each button
• nice UI way to represent the different dates for summer school and hackathon