Proposal: Rename Voice Server to Notification Server

[sti0]

Hi @danielmiessler,

what do you think about renaming the voice server into notification server. As of today it supports already voice audio and desktop notifications. Therefore its already not a single voice server.

With this change we can introduce new notification methods like apprise (activation totally optional, handled by env). This will allow advanced methods of automation and notification leveraging webhooks and over 110 services out of the box.

If you agree I would like to incorporate a PR.

Looking forward to hear from you.

BR