chore: update article ld+json

Author: muhammad-ali-pk

templates/blog/article.html

@@ -34,13 +34,19 @@
         "name": "{{ article.author.name }}"
       },
       "datePublished": "{{ article.date_gmt }}",
+      "dateModified": "{{ article.modified_gmt }}",
       {% if article.image and article.image.source_url %}
       "image": "{{ article.image.source_url }}",
       {% endif %}
       "url": "{{ self.canonical_url() }}",
       "publisher": {
         "@type": "Organization",
-        "name": "{% if is_canonical_announcement %}Canonical{% else %}Ubuntu{% endif %}"
+        "@id": "{% if is_canonical_announcement %}https://canonical.com{% else %}https://ubuntu.com{% endif %}",
+        "name": "{% if is_canonical_announcement %}Canonical{% else %}Ubuntu{% endif %}",
+        "logo": {
+          "@type": "ImageObject",
+          "url": "https://assets.ubuntu.com/v1/c55060fd-COF%20android-chrome-512x512.png"
+        }
       }
     }
 </script>