#3874 featured projects card

[chrisdicono]

Changes

• Commented out code that may be used later in IntroGuestHomePage.tsx
• Project Cards now look like mocks
• Responsive: Featured Projects section vertical on mobile devices and horizontal on everything else

Screenshots

Checklist

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• All commits are tagged with the ticket number
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• All code follows repository-configured prettier formatting
• No merge conflicts
• All checks passing
• Screenshots of UI changes (see Screenshots section)
• Remove any non-applicable sections of this template
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• No yarn.lock changes (unless dependencies have changed)
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Closes #3874