block posts layout alternate

layouts/partials/blocks/templates/posts/alternate.html

+<div class="alternate">
+  {{ range $post := .posts -}}
+    {{ with site.GetPage (printf "/posts/%s" $post) }}
+      {{ partial "posts/post.html" (dict 
+        "post" .
+        "heading" "h3"
+        ) }}
+    {{ end }}
+  {{ end }}
+</div>
\ No newline at end of file