Tournament List
List all tournaments or create a new tournament.
GET /api/v1/tournaments/?format=api&ordering=board_size&page=821
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"active_round": null, "icon": "https://user-uploads.online-go.com/dc9146aa65b9a001214cf5f3ed95a719-15.png", "player_count": 15, "ranked": true } ] }
