Tournament List
List all tournaments or create a new tournament.
GET /api/v1/tournaments?format=api&ordering=board_size&page=518
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"active_round": null, "icon": "https://user-uploads.online-go.com/4075bf2d260d7d5780f23dc8992c0381-15.png", "player_count": 5, "ranked": true } ] }
