Firebase Storage

References
https://medium.com/@daggerdwivedi/set-up-firebase-to-upload-user-files-165063cbeee1
https://firebase.googleblog.com/2016/07/5-tips-for-firebase-storage.html
https://medium.com/@mheavers/setting-up-a-basic-file-upload-feature-for-your-static-website-with-just-javascript-using-firebase-32464580d8bb
https://firebase.google.com/docs/storage/web/upload-files