add link

src/client/js/components/PageEditorByHackmd.jsx

@@ -243,6 +243,7 @@ class PageEditorByHackmd extends React.Component {
       content = (
         <div>
           <p className="text-center hackmd-status-label"><i className="fa fa-file-text"></i> { t('hackmd.not_set_up')}</p>
+          <a href="https://docs.growi.org/ja/admin-guide/">GROWI Docs 管理者ガイド</a>
         </div>
       );
     }