Support end to end encryption

What do you think about supporting end to end encryption for all notes?

The URLs are already to long to remember, so we could just add a client generated symmetric key to encrypt the note. I'm currently not sure about the syncing process with encrypted data, do you have an idea how this would theoretically work?

No files, tests, or entry points are named. Start by mapping how notes are created, stored, and synced, then investigate how a client-generated symmetric key could work across those paths. Done would require an agreed encryption and syncing design, followed by implementation and verification.

Scritto dal modello di indicizzazione a partire dal testo della issue.