Updating documentation and examples

[hestiahacker]

This closes #932

• Updated examples to use the new disks syntax
• Added the cloudini_cdrom_storage (now a required argument) and boot order (to work around Cloud-init drive delete when cloning vm with cloud-init drive #901 until it is fixed)
• Updated documentation on the cloud_init_disk to have a disks block in the example and point to the easier way to use cloud-init
• Pointed to the example file in the cloud_init guide

[Tinyblargon]

With the new disk schema it should be like this:

cd {
  iso = "${local.iso_storage_pool}:${proxmox_cloud_init_disk.ci.id}
}

Not 100% sure what local.iso_storage_pool and proxmox_cloud_init_disk.ci.id are in this situation.

[hestiahacker]

Thanks for the review and correction. I think it should be good to go now

[TAAGECH9]

@Tinyblargon , do you think this PR could be merged 😄? I was struggling on my own with exactly the same issue and wanted to create a PR and then realized that there is already this PR open. Would be nice to have it in the codebase 🚀

[TAAGECH9]

@Tinyblargon ,that was quick 🔥. Thank you very much ❤️