Fix: delete unused files

htdocs/includes/ckeditor/_source/plugins/about/plugin.js

@@ -1,24 +0,0 @@
-/*
-Copyright (c) 2003-2011, CKSource - Frederico Knabben. All rights reserved.
-For licensing, see LICENSE.html or http://ckeditor.com/license
-*/
-
-CKEDITOR.plugins.add( 'about',
-{
-	requires : [ 'dialog' ],
-	init : function( editor )
-	{
-		var command = editor.addCommand( 'about', new CKEDITOR.dialogCommand( 'about' ) );
-		command.modes = { wysiwyg:1, source:1 };
-		command.canUndo = false;
-		command.readOnly = 1;
-
-		editor.ui.addButton( 'About',
-			{
-				label : editor.lang.about.title,
-				command : 'about'
-			});
-
-		CKEDITOR.dialog.add( 'about', this.path + 'dialogs/about.js' );
-	}
-});