Add rich social sharing support

templates/project.html

@@ -1,5 +1,7 @@
 {% extends "base.html" %}
 {% from "macros/tag-links.html" import tag_links, taxonomy_labels with context %}
+{% from "macros/social-sharing.html" import social_metadata, share_controls with context %}
+{% block social_head %}{{ social_metadata(this, 'SoftwareSourceCode', 'website') }}{% endblock %}
 {% block body %}
 {% set devlog = site.get(this.path ~ '/devlog') %}
 <article class="project-page">
@@ -70,6 +72,7 @@
         </div>
       </dl>
     </aside>
+    {{ share_controls(this, 'project') }}
   </div>
 
   {% if this.technology_labels %}