Feature request: add folders

[LorenzoZappa]

I am using Scriberr on a daily basis, the only feature that it really lacks is the ability to create folders.
Right now I have many recordings and having all of them in the same page is kinda messy, a simple folder structure would be great!
Thank you 🙌🏻

[paulirish]

just to crosslink: #402 has the concept of collections, which seems like the same.