docs: explain image config in detail

Felix Boerner

22.16.2025 4d04c015c530c4f88fd73d29df465c2588ac35cc

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{
  "budget": {
    "requests": {
      "total": 8
    },
    "transferSize": {
      "total": 365568
    },
    "thirdParty": {
      "requests": 1
    },
    "score": {
      "bestpractice": 93,
      "privacy": 89,
      "performance": 81
    }
  }
}