Support sounds

web/public/static/sounds/beep.mp3

web/public/static/sounds/juntos.mp3

web/public/static/sounds/mixkit-correct-answer-tone.mp3

web/public/static/sounds/mixkit-long-pop.mp3

web/public/static/sounds/mixkit-message-pop-alert.mp3

web/public/static/sounds/mixkit-software-interface-start.mp3

web/public/static/sounds/pristine.mp3

web/src/app/Notifier.js

web/src/app/Prefs.js

web/src/app/SubscriptionManager.js

web/src/app/utils.js

web/src/components/App.js

web/src/components/Preferences.js