Add post-clone.yml and edit-config.yml to the task list, and document
the previously undocumented optional variables (lxc_unprivileged,
lxc_mounts, lxc_onboot, lxc_startup, lxc_timezone, lxc_nvidia_gpu_mount,
gpu_device_id, uvm_device_id, lxc_id_mappings).
- Document proxmox_delegate_host for delegating pct commands to inventory host
- Update check-exists.yml description to reflect vmid or hostname checking
- Document lxc_exists fact set by idempotency check