call GrowiRenderer and setup it in plugin.

src/client/js/util/reveal/plugins/growi-renderer.js

@@ -2,6 +2,7 @@
  * reveal.js growi-renderer plugin.
  */
 (function() {
-  // import GrowiRenderer from '../../GrowiRenderer';
-  let growiRenderer;
+  const GrowiRenderer = require('../../GrowiRenderer');
+  let growiRenderer = new GrowiRenderer(null, null, null);
+  growiRenderer.setup();
 });