Search discoverable guilds

curl --request GET \
  --url https://api.fluxer.app/v1/discovery/guilds \
  --header 'Authorization: <api-key>'

{
  "guilds": [
    {
      "id": "<string>",
      "name": "<string>",
      "category_type": 123,
      "member_count": 123,
      "online_count": 123,
      "features": [
        "<string>"
      ],
      "verification_level": 123,
      "icon": "<string>",
      "description": "<string>"
    }
  ],
  "total": 123
}