Fix a symbol-scoping bug in the static pages plugin.

plugins/static-pages.lisp

 
 (defmethod initialize-instance :after ((object page) &key)
   ;; Expect all static-pages to be written in Markdown for now.
-  (with-slots (url text) object
+  (with-slots (url coleslaw::text) object
     (setf url (make-pathname :defaults url)
-          text (render-text text :md))))
+          coleslaw::text (render-text coleslaw::text :md))))
 
 (defmethod render ((object page) &key next prev)
   ;; For the time being, we'll re-use the normal post theme.