SEO-Bericht: museum.nl

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Fix all SEO issues found in the audit of museum.nl.

Prioritize high-severity issues first, then medium. For each fix, make the actual code change — don't just describe what to do.

```json
{
  "domain": "museum.nl",
  "scores": {
    "overall": 86,
    "performance": 0,
    "seo": 88,
    "accessibility": 77,
    "bestPractices": 94,
    "security": 86
  },
  "findings": [
    {
      "module": "dns",
      "severity": "medium",
      "title": "Missing DMARC record",
      "description": "No DMARC policy found at _dmarc subdomain.",
      "recommendation": "Add a DMARC TXT record to prevent email spoofing"
    },
    {
      "module": "dns",
      "severity": "medium",
      "title": "No DKIM record found",
      "description": "None of the common DKIM selectors returned a valid key. Email authentication may be incomplete.",
      "recommendation": "Configure DKIM signing with your email provider and publish the public key in DNS"
    },
    {
      "module": "meta",
      "severity": "medium",
      "title": "Meta description too short",
      "description": "Description is 51 characters (recommended: 120-160)",
      "recommendation": "Write a more detailed meta description"
    },
    {
      "module": "meta",
      "severity": "medium",
      "title": "Missing canonical URL",
      "description": "No canonical link tag found",
      "recommendation": "Add a canonical URL to prevent duplicate content issues"
    },
    {
      "module": "content",
      "severity": "high",
      "title": "No H1 tag found",
      "description": "The page has no H1 heading",
      "recommendation": "Add exactly one H1 tag with the primary keyword"
    },
    {
      "module": "content",
      "severity": "medium",
      "title": "Low keyword relevance",
      "description": "Only 25% of title keywords appear in body text",
      "recommendation": "Ensure the page content includes the keywords from the title"
    },
    {
      "module": "accessibility",
      "severity": "medium",
      "title": "No skip navigation link",
      "description": "No skip-to-content link at the top of the page",
      "recommendation": "Add a visually hidden skip link as the first focusable element"
    },
    {
      "module": "accessibility",
      "severity": "high",
      "title": "11 buttons without accessible name",
      "description": "Buttons with no text, aria-label, or title are invisible to screen readers",
      "recommendation": "Add visible text or aria-label to all buttons"
    },
    {
      "module": "rate-limits",
      "severity": "medium",
      "title": "No rate limiting detected",
      "description": "10 rapid requests all succeeded without any rate-limit headers or 429 responses. The site may be vulnerable to abuse.",
      "recommendation": "Implement rate limiting (e.g., 429 Too Many Requests) to protect against brute-force attacks"
    },
    {
      "module": "brand-checker",
      "severity": "medium",
      "title": "No Organization schema",
      "description": "No Organization JSON-LD found",
      "recommendation": "Add Organization structured data with name, logo, and contact information"
    },
    {
      "module": "page-experience",
      "severity": "high",
      "title": "Intrusive interstitials detected",
      "description": "Found 3 potential popup/overlay elements",
      "recommendation": "Reduce intrusive interstitials — they hurt mobile experience and can trigger Google penalties"
    },
    {
      "module": "indexing-checker",
      "severity": "medium",
      "title": "Missing canonical URL",
      "description": "No canonical link tag found — search engines may index duplicate versions",
      "recommendation": "Add a self-referencing canonical URL to prevent duplicate content issues"
    },
    {
      "module": "log-analyzer",
      "severity": "medium",
      "title": "X-Powered-By header exposed",
      "description": "X-Powered-By: ASP.NET",
      "recommendation": "Remove the X-Powered-By header to reduce information leakage"
    }
  ]
}
```