Migrate to tufte-css

templates/post.html

@@ -1,8 +1,6 @@
-<div class="info">
-    Posted on $date$
-    $if(author)$
-        by $author$
-    $endif$
-</div>
+<article class="group">
+    <h1>$title$</h1>
+    <p class="subtitle">$date$</p>
 
-$body$
+    $body$
+</article>