Add schema.org JSON-LD structured data

Docsy calls Hugo's _internal/schema.html, which emits only a handful of
sparse microdata meta tags. Search engines and retrieval systems get no
explicit signal about what kind of page they are looking at, who
publishes it, or when it was last updated.

Emits one JSON-LD block per page:

  - WebSite on the home page
  - TechArticle for documentation pages
  - BlogPosting for blog posts, with datePublished and author

All three carry an Organization publisher and inLanguage, so the four
language variants are described accurately. dateModified comes from
.Lastmod, which is already backed by git commit dates via enableGitInfo,
making freshness explicit rather than something a crawler has to guess.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: AutomatedTester

website_and_docs/layouts/partials/hooks/head-end.html

@@ -5,7 +5,9 @@
 <script src="/js/docsearch-fix.js"></script>
 {{ end }}
 {{/*
-  Canonical and hreflang links. Docsy emits neither for HTML pages.
+  Canonical and hreflang links, and schema.org structured data. Docsy emits no
+  canonical link and no hreflang alternates, and its call to Hugo's
+  _internal/schema.html produces only sparse microdata.
 
   Skipped for the "print" output format, whose pages already get a canonical
   link pointing back at the HTML page from Docsy's own alternate-format loop.
@@ -30,4 +32,52 @@
 {{- end }}
 {{- end }}
 {{- end }}
+
+{{- $publisher := dict
+      "@type" "Organization"
+      "name" "Selenium"
+      "url" .Site.BaseURL
+      "logo" (dict "@type" "ImageObject" "url" (absURL "images/selenium_logo_square_green.png"))
+      "sameAs" (slice
+        "https://github.com/SeleniumHQ/selenium"
+        "https://www.linkedin.com/company/4826427/"
+        "https://x.com/SeleniumHQ"
+        "https://www.youtube.com/@SeleniumHQProject/") -}}
+{{- $ld := false -}}
+{{- if .IsHome -}}
+  {{- $ld = dict
+        "@context" "https://schema.org"
+        "@type" "WebSite"
+        "name" .Site.Title
+        "url" .Site.BaseURL
+        "description" .Site.Params.description
+        "inLanguage" .Language.Lang
+        "publisher" $publisher -}}
+{{- else if eq .Section "documentation" -}}
+  {{- $ld = dict
+        "@context" "https://schema.org"
+        "@type" "TechArticle"
+        "headline" .Title
+        "url" .Permalink
+        "inLanguage" .Language.Lang
+        "dateModified" (.Lastmod.Format "2006-01-02")
+        "publisher" $publisher
+        "isPartOf" (dict "@type" "WebSite" "name" .Site.Title "url" .Site.BaseURL) -}}
+  {{- with .Description }}{{ $ld = merge $ld (dict "description" .) }}{{ end -}}
+{{- else if eq .Section "blog" -}}
+  {{- $ld = dict
+        "@context" "https://schema.org"
+        "@type" "BlogPosting"
+        "headline" .Title
+        "url" .Permalink
+        "inLanguage" .Language.Lang
+        "datePublished" (.Date.Format "2006-01-02")
+        "dateModified" (.Lastmod.Format "2006-01-02")
+        "publisher" $publisher -}}
+  {{- with .Description }}{{ $ld = merge $ld (dict "description" .) }}{{ end -}}
+  {{- with .Params.author }}{{ $ld = merge $ld (dict "author" (dict "@type" "Person" "name" .)) }}{{ end -}}
+{{- end }}
+{{- with $ld }}
+<script type="application/ld+json">{{ . | jsonify (dict "indent" "  ") | safeJS }}</script>
+{{- end }}
 {{ end }}