[Implemented] Disable "News" from the dashboard

@stefanvanruiten said:
what does “hide” entail exactly? Will that be the same as turning it off entirely? I do not want any part of it in my network if I can prevent it? Is there a nuance here?

Happy to elaborate on the functionality. Since News is tied to a Plex account and not a server, users will be able to enable/disable it for their own accounts (Managed Users already have it disabled). Once disabled, the service will not interact with (or send data to) the client.