update wizard pictures, app logo, desktop name

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/cbf65081101b454e971ec633398bfcb5/
tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/5175b9670b4a4ebca3e24f725909c2c4/

Change-Id: I143c425ef8576b4adb1158a9a46a7ac20df7f4e1