Adding a new module for the general layout

Signed-off-by: Jorge Omar Vazquez <jorgeomar.vazquez@gmail.com>
General css centralized

Signed-off-by: Jorge Omar Vazquez <jorgeomar.vazquez@gmail.com>
Fixing the layout of the module user.
Fixing constants in landing.
Fixing constants in user.

Signed-off-by: Jorge Omar Vazquez <jorgeomar.vazquez@gmail.com>