Introduce global theme partials.

partials/html/writing.html

@@ -0,0 +1,12 @@
+{{#section "writing"}}
+<section id="publications">
+  <header>
+  <h2>{{{sectionTitle "Writing"}}}</h2><hr>
+  </header>
+  {{#each r.writing }}
+    <h3><em>{{#if url}}<a href="{{{ url }}}">{{{ title }}}</a>{{else}}{{{ title }}}{{/if}}</em>,
+      {{ publisher.name }} <span class="tenure">{{formatDate safe.date 'YYYY'}}</span></h3>
+  {{# if summary}}{{{ summary }}}{{/if}}
+  {{/each}}
+</section>
+{{/section}}