Add date and link to next game on Join Us card

[vientang]

The join us card on the home page currently links to the groups page on Meetup. We need to link it to an actual game.

• Link it to the next scheduled game
• Add date, time and field location

Maybe include:

• Weather info
• Organizer
• RSVP/Waitlist count
• Tournament?
• Special note from organizer