Audio levels work

package.json

src/assets/images/level_fill.png

src/assets/images/level_fill@2x.png

src/assets/images/mic_level.png

src/assets/images/mic_level@2x.png

src/assets/images/mic_small.png

src/assets/images/mic_small@2x.png

src/assets/images/package.json

src/assets/images/speaker_level.png

src/assets/images/speaker_level@2x.png

src/assets/images/yarn.lock

src/react-components/ui-root.js

src/room.scss

yarn.lock