Add JSON-LD structured data for improved SEO

Add Organization, WebSite, and SoftwareApplication schema.org
markup to the homepage head partial, enabling rich search results
with app category, pricing (free), license, and social profiles.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

layouts/partials/head.html

@@ -76,5 +76,65 @@
 
   <link rel="alternate" href="{{ "/index.xml" | absURL }}" type="application/rss+xml" title="{{ .Site.Title }}">
 
+  <!-- Structured Data (JSON-LD) -->
+  {{ if .IsHome }}
+  <script type="application/ld+json">
+  {
+    "@context": "https://schema.org",
+    "@graph": [
+      {
+        "@type": "Organization",
+        "@id": "{{ .Site.BaseURL }}#organization",
+        "name": "happyDomain",
+        "url": "{{ .Site.BaseURL }}",
+        "logo": {
+          "@type": "ImageObject",
+          "url": "{{ .Site.BaseURL }}img/happydomain.png"
+        },
+        "sameAs": [
+          "https://floss.social/@happyDomain",
+          "https://github.com/happyDomain/happydomain",
+          "https://framagit.org/happyDomain/happydomain"
+        ]
+      },
+      {
+        "@type": "WebSite",
+        "@id": "{{ .Site.BaseURL }}#website",
+        "name": "happyDomain",
+        "url": "{{ .Site.BaseURL }}",
+        "description": "{{ $description }}",
+        "inLanguage": ["en", "fr"],
+        "publisher": {
+          "@id": "{{ .Site.BaseURL }}#organization"
+        }
+      },
+      {
+        "@type": "SoftwareApplication",
+        "@id": "{{ .Site.BaseURL }}#software",
+        "name": "happyDomain",
+        "url": "{{ .Site.BaseURL }}",
+        "description": "{{ $description }}",
+        "applicationCategory": "DeveloperApplication",
+        "operatingSystem": "Linux, Windows, macOS, Docker",
+        "license": "https://www.gnu.org/licenses/agpl-3.0.html",
+        "offers": {
+          "@type": "Offer",
+          "price": "0",
+          "priceCurrency": "USD"
+        },
+        "screenshot": "{{ .Site.BaseURL }}img/og.webp",
+        "softwareHelp": {
+          "@type": "WebPage",
+          "url": "https://help.happydomain.org/"
+        },
+        "author": {
+          "@id": "{{ .Site.BaseURL }}#organization"
+        }
+      }
+    ]
+  }
+  </script>
+  {{ end }}
+
   <script async defer data-website-id="a10b2ee8-ed13-4acb-a017-0b9a661f31c3" src="https://pythagore.p0m.fr/pythagore.js"></script>
 </head>