Another solution for the data creation

[Builditluc]

Hi @ukmrs!

As mentioned in #27, the copying of the storage folder during build time causes some issues when building the package with nix (EDIT: doing stuff with the data dirs during buildtime does generally not work for packagers).

One solution for this coming to mind is to check during runtime if the data exists and if not, ask the user whether we should download it for them (we can download the file from github).

If you want, I would be happy to try and implement this myself. What do you think, do you have another idea in your mind?

Cheers