Multiple loadbalanced Jitsi Meet setups

[wolfm89]

Jitsi uses the term "shard" to describe the composition that contains single containers for
web, jicofo, prosody and multiple containers of jvb running in parallel.

Right now we only have a single shard defined. This is not a fail-safe setup as we're only running single pods for web, jicofo, and prosody.

Sharding can be achieved by using a HAProxy in front of all shards and routing the incoming requests based on chat room specified in the path (HAProxy stick tables). More info on this topic can be found here: https://jitsi.org/blog/new-tutorial-video-scaling-jitsi-meet-in-the-cloud/

[wolfm89]

We have implemented a multi-shard setup. More info can be found in the architecture documentation.