Integrate pilcrow change from Docco

Rocco uses the Docco CSS directly, so when they make an update to the
HTML/CSS, Rocco needs to play along.  In this case, Docco changed from
`#` to `¶`, and changed classnames as well (in
[f8a88d66b381a1c04358][]).

This commit migrates that change to Rocco.

[f8a88d66b381a1c04358]:
f8a88d66b3

lib/rocco/layout.mustache

@@ -31,8 +31,8 @@
     {{#sections}}
     <tr id='section-{{ num }}'>
       <td class=docs>
-        <div class="octowrap">
-          <a class="octothorpe" href="#section-{{ num }}">#</a>
+        <div class="pilwrap">
+          <a class="pilcrow" href="#section-{{ num }}">&#182;</a>
         </div>
         {{{ docs }}}
       </td>