[DASH-8] Main Dashboard

[BlazingAsher]

• Discord and useful links section
• Show hacker status
• Expandable check in QR
  • The QR code can be retrieved with the /action/checkInQR endpoint. You don't need to worry about overlaying the Hack the 6ix logo.
• Decline invitation button (should NOT be visible when checked in)

Please ensure implementation conforms to both desktop and mobile designs. I would strongly advise using CSS grid as that will make it really easy for the desktop and mobile section orders to be changed.