buildroot

docs: responsive web design website - upgrading bootstrap/jquery

* Upgrading to Bootstrap 3.2.0
* Upgrading to Jquery 1.11.1
* Removing older files

Signed-off-by: Angelo Compagnucci <angelo.compagnucci@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>