AJAXify the form submission

[athityakumar]

Reference -

$.ajax({
        type: "POST",
        url: "//formspree.io/[email protected]",
        data: $(form).serialize(), // serializes the form's elements.
        dataType: 'json',
        success: function(data)
        {
            $('.form-sent').slideDown(400); // show response from the php script.
        }
      });