List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-board_size&page=3394
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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    "previous": "https://online-go.com/api/v1/tournaments/?format=api&ordering=-board_size&page=3393",
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