If you’ve moved the libs folder then I guess the hardcoded path in “libs/jquery-loader.js” is not accurate any more and jQuery doesn’t get loaded at all. So just check/fix this line:
var path = '../libs/jquery/jquery.js';
Or, alternatively, you can opt to not use “jquery-loader.js” at all and instead include directly your prefered jQuery version on your pages – e.g.:
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
The loader script is just used on the demo page to allow easy testing with different jQuery versions.