[DOCS] Explanation of scaling features

[lsnow99]

Hello! I'm very interested in using neffos to build a chat application. Scaling has been a concern in the past, and I found neffos after researching scalable websocket implementations in Go.

So I'm trying to wrap my head around how deployment works with neffos if I want a scalable setup. We currently deploy in kubernetes. Is it possible to create a redis cluster, scale up several neffos-based miniservices, and allow any client to connect to any room from any instance of the server? Or do all clients connecting to the same room have to be connected to the same backend instance? That would be fantastic if it's the former.

Thank you