website: add Bootstrap and JQuery frameworks

Add Bootstrap framework, along with JQuery.

Theses files were downloaded from:
  - http://getbootstrap.com
  - http://jquery.com/



Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>