Informe SEO: theblackmarbleselection.nl

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Fix all SEO issues found in the audit of theblackmarbleselection.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": "theblackmarbleselection.nl",
  "scores": {
    "overall": 70,
    "performance": 0,
    "seo": 52,
    "accessibility": 81,
    "bestPractices": 88,
    "security": 76
  },
  "findings": [
    {
      "module": "cookies",
      "severity": "medium",
      "title": "2 cookies missing Secure flag",
      "description": "Cookies without Secure flag can be sent over unencrypted HTTP connections",
      "recommendation": "Add the Secure attribute to all cookies to prevent transmission over HTTP"
    },
    {
      "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": "headers",
      "severity": "high",
      "title": "Missing strict-transport-security",
      "description": "HSTS header is missing. The site may be vulnerable to downgrade attacks.",
      "recommendation": "Add Strict-Transport-Security header with max-age of at least 31536000"
    },
    {
      "module": "headers",
      "severity": "medium",
      "title": "CSP allows unsafe-eval",
      "description": "Content-Security-Policy uses 'unsafe-eval' which allows dynamic code execution",
      "recommendation": "Remove 'unsafe-eval' and refactor code to avoid eval()"
    },
    {
      "module": "headers",
      "severity": "high",
      "title": "HTTP 403 error",
      "description": "Server returned HTTP 403",
      "recommendation": "Fix the server error to return a 200 status"
    },
    {
      "module": "meta",
      "severity": "medium",
      "title": "Title too short",
      "description": "Title is 16 characters (recommended: 50-60)",
      "recommendation": "Write a more descriptive title (50-60 characters)"
    },
    {
      "module": "meta",
      "severity": "high",
      "title": "Missing meta description",
      "description": "No meta description tag found",
      "recommendation": "Add a meta description (120-160 characters)"
    },
    {
      "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": "meta",
      "severity": "medium",
      "title": "Missing og:title",
      "description": "Open Graph title is not set",
      "recommendation": "Add og:title meta tag for social sharing"
    },
    {
      "module": "meta",
      "severity": "medium",
      "title": "Missing og:image",
      "description": "No Open Graph image set. Social shares will lack a preview image.",
      "recommendation": "Add og:image meta tag (1200x630px recommended)"
    },
    {
      "module": "meta",
      "severity": "high",
      "title": "Page set to noindex",
      "description": "This page has a noindex robots meta tag",
      "recommendation": "Remove noindex if this page should be indexed"
    },
    {
      "module": "meta",
      "severity": "medium",
      "title": "Page set to nofollow",
      "description": "This page has a nofollow robots meta tag — links won't pass authority",
      "recommendation": "Remove nofollow unless intentional"
    },
    {
      "module": "structured-data",
      "severity": "medium",
      "title": "No structured data found",
      "description": "No JSON-LD schemas detected on the page",
      "recommendation": "Add structured data (Organization, WebSite, BreadcrumbList) for rich search results"
    },
    {
      "module": "sitemap",
      "severity": "high",
      "title": "Missing sitemap.xml",
      "description": "No sitemap.xml found at the root",
      "recommendation": "Create a sitemap.xml to help search engines discover all pages"
    },
    {
      "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": "Thin content",
      "description": "Page has only 0 words (recommended: 300+)",
      "recommendation": "Add more meaningful content — aim for at least 300 words on key pages"
    },
    {
      "module": "content",
      "severity": "medium",
      "title": "Very low text-to-HTML ratio",
      "description": "Text/HTML ratio is 0% (recommended: >5%)",
      "recommendation": "Increase meaningful text content relative to HTML markup"
    },
    {
      "module": "content",
      "severity": "medium",
      "title": "No internal links",
      "description": "No internal links found on the page",
      "recommendation": "Add internal links to help search engines discover and understand your site structure"
    },
    {
      "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": "medium",
      "title": "No headings found",
      "description": "Page has no heading elements (H1-H6)",
      "recommendation": "Add headings to structure content for screen readers and SEO"
    },
    {
      "module": "social-checker",
      "severity": "high",
      "title": "Missing og:title",
      "description": "Open Graph title is not set — social shares will use generic text",
      "recommendation": "Add og:title meta tag for compelling social media previews"
    },
    {
      "module": "social-checker",
      "severity": "medium",
      "title": "Missing og:description",
      "description": "Open Graph description is not set",
      "recommendation": "Add og:description for better social sharing previews"
    },
    {
      "module": "social-checker",
      "severity": "medium",
      "title": "Missing og:image",
      "description": "No social sharing image set — posts will lack visual appeal",
      "recommendation": "Add og:image meta tag (1200x630px recommended)"
    },
    {
      "module": "social-checker",
      "severity": "medium",
      "title": "Missing Twitter Card",
      "description": "No twitter:card meta tag — Twitter/X will use default preview",
      "recommendation": "Add twitter:card meta tag (e.g., \"summary_large_image\")"
    },
    {
      "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": "brand-checker",
      "severity": "medium",
      "title": "Missing favicon",
      "description": "No favicon link tag found",
      "recommendation": "Add a favicon for brand recognition in browser tabs and bookmarks"
    },
    {
      "module": "crawl-budget",
      "severity": "medium",
      "title": "No sitemap.xml found",
      "description": "sitemap.xml returned HTTP 403",
      "recommendation": "Create a sitemap.xml to help search engines discover all pages"
    },
    {
      "module": "indexing-checker",
      "severity": "high",
      "title": "Page set to noindex",
      "description": "The homepage has a noindex directive — it will not appear in search results",
      "recommendation": "Remove the noindex directive from the homepage meta robots tag"
    },
    {
      "module": "indexing-checker",
      "severity": "medium",
      "title": "Page set to nofollow",
      "description": "The homepage has a nofollow directive — links won't pass authority",
      "recommendation": "Remove nofollow unless you intentionally want to block link equity flow"
    },
    {
      "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"
    }
  ]
}
```