Documentation on making user VMs
We should write some docs for how user VMs are made, and our rules around them.
Some notes:
- We can use Proxmox's LXC container features for a slightly lighter 'VM', at least in most cases
- When we do, we need to customise the DNS, and make sure they're on vmbr1 (unmanaged)
- We should figure out exactly when and when not LXC is suitable
- We could investigate using the Proxmox API to automatically provision them.