Add rudimentary script for generating the forum archive.

templates/posts.mustache

@@ -0,0 +1,16 @@
+{{>header}}
+<h2><a href="../">{{board.name}}</a></h2>
+<h3>{{thread.subject}} - Page {{next}}</h3>
+{{>pagination}}
+{{#posts}}
+<article id="post-{{id_msg}}">
+    <header>
+        <h4>{{subject}}</h4>
+        <div><span class="label">Posted by:</span> {{poster_name}}</div>
+        <div><span class="label">Date:</span> {{datetime}}</div>
+    </header>
+    <section>{{{body}}}</section>
+</article>
+{{/posts}}
+{{>pagination}}
+{{>footer}}