Moved /doc/ to /doc-src/

Moved the doc/ dir to /doc-src/ so that the actual
markdown files aren't substituted for the docs.

actions/doc.php

@@ -59,7 +59,7 @@ class DocAction extends Action
     {
         parent::handle($args);
         $this->title    = $this->trimmed('title');
-        $this->filename = INSTALLDIR.'/doc/'.$this->title;
+        $this->filename = INSTALLDIR.'/doc-src/'.$this->title;
         if (!file_exists($this->filename)) {
             $this->clientError(_('No such document.'));
             return;