change logo and remove audio support

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/f0ad7b0f08c04c39ad384c055b063b1d/#137e5ad9331c48ce82a9383b6f02eb17

Change-Id: Ie50ee084a921d74b7321e4b9847c5eb9abfb6e72