Simplify server and agent definition for kubernetes

The definition was split into multiple settings, that made it
unnecessary complicated to setup the definition for my kubernetes
cluster. This new approach allows for granular definitions of servers
and agents and is also simpler to use for me.

main.tf

@@ -9,16 +9,8 @@ module "k8s" {
 
   name     = "cluster1"
   ssh_keys = [for o in hcloud_ssh_key.this : o.id]
-  servers = [for n in range(var.k8s_server_count) : {
-    type          = var.k8s_server_type
-    location      = var.k8s_location
-    ip_datacenter = var.k8s_ip_datacenter
-  }]
-  agents = [{
-    type     = var.k8s_agent_type
-    location = var.k8s_location
-    count    = var.k8s_agent_count
-  }]
+  servers = var.k8s_servers
+  agents = var.k8s_agents
   auto_delete_primary_ips = false
   kubernetes_exposed_ips  = var.kubernetes_allowed_ips
   ssh_exposed_ips         = var.ssh_allowed_ips