add(new MetaTag("description", Model.of("description"), Model.of("Apache Wicket & Bootstrap Demo")));
add(new MetaTag("author", Model.of("author"), Model.of("Michael Haitz <michael.haitz@agile-coders.de>")));
add(newNavbar("navbar"));
add(newNavigation("navigation"));
add(new Footer("footer"));
add(new Code("code-internal"));
add(new HeaderResponseContainer("footer-container", "footer-container"));