Update landing page UI

[saranshkr]

• Navbar seems shorter than hero
• Remove list of teams/orgs right below hero
• Consider switching to a different color scheme
• Add hover effects on buttons
• Update hero headline
• "How it works" section seems to have 01 and 02 in reverse order
• No "Product Features" tab on navbar
• "See demo" button on hero needs to be fixed

[saranshkr]