Move implementation into src

packages/notification/assets/favicon.ico

packages/notification/assets/index.html

packages/notification/i18next-scanner.config.js

packages/notification/package.json

packages/notification/rollup.config.js

packages/notification/src/demo.js

packages/notification/src/i18n.js

packages/notification/src/i18n/de/translation.json

packages/notification/src/i18n/en/translation.json

packages/notification/src/index.js

packages/notification/src/notification.js

packages/notification/src/utils.js

packages/notification/src/vpu-notification-demo.js

packages/notification/src/vpu-notification.js