RFE: Archive after audio playback

**Is your feature request related to a problem? Please describe.**
Yes. I'd love the Wallabag Android app to have the option to auto-archive articles after audio playback. I've recently migrated from Pocket and enjoyed that feature. Without auto-archiving, I lose track of what I already heard.

**Describe the solution you'd like**
At the end of audio playback, I'd love for Wallabag to archive the article. I'm sure that not everyone would want this feature, so making it an option would be great.

**Describe alternatives you've considered**
I'm manually archiving saves after a listening session before I forget, but this is cumbersome, error-prone, and could ideally be automatic.

Thanks you for considering this!