Create Hetzner cloud servers in Nuremberg (Germany)

Follow-up to [1]; while most of our cloud servers are in Helsinki, the
latency from most of Europe is lower when accessing servers in Germany.

Pinging from multiple locations using ping.pe, the latency to Nuremberg
from most locations appears to be 10-20ms lower (compared to Helsinki).

[1] !500

tf-stage1/templates.tf

@@ -110,7 +110,7 @@ resource "hcloud_server" "machine" {
   name        = each.key
   image       = data.hcloud_image.archlinux.id
   server_type = each.value.server_type
-  location    = "hel1"
+  location    = "nbg1"
   lifecycle {
     ignore_changes = [image, location]
   }