Outdated Quickstart docs for Zos

[rowangamal]

Outdated Quickstart for Zos

The quickstart docs is outdated regarding many points:

1. Only Qemu is required now, dnsmasq actually made me some extra problems with ports and it isn't needed.
2. The Create a farm link is linking to an unfound page, I think the new link should be Create a farm
3. Setup the network using this script [this script](https://github.com/threefoldtech/zos/blob/main/qemu/net.sh) isn't needed anymore --> substitute by running

cd qemu && make net

4. The line sudo ./vm.sh -n node-01 -c "farmer_id=<your farm id here> printk.devmsg=on runmode=dev" also could be subbed by: (in qemu directory)

make run id=<farm id> user=<your github user>