Removed old practices (Iaido, Judo and Shiatzu)

Signed-off-by: Sergio Schvezov <sergio.schvezov@canonical.com>
Removing closed dojo

Signed-off-by: Sergio Schvezov <sergio.schvezov@canonical.com>
Adding poster for event seminario 30 años.

Signed-off-by: Sergio Schvezov <sergio.schvezov@canonical.com>
Removing old graphical assets

Signed-off-by: Sergio Schvezov <sergio.schvezov@canonical.com>