[UI] Website small updates

[mdaria17]

• add button hovers – link
• add tiles hovers – link (gray-800 #2F2F2F + add arrow icon when hovering in the right corner)
• make all tile areas clickable
• add on mobile arrows on the right corners in the "Unified global state..." block – link
• update text here – link
• update text in the roadmap button on mobile. Should be as on the web – link
• make partners' scroll animation slower on the mobile

Video of how it should work – link