Merge infra and k3 into one directory again

Since I don't have multiple terraform steps anymore it simply doesn't
make sense to me anymore to split all tasks into separate folders.
Instead I try to be as clear as possible in the README to make it easy
to follow the structure in the future without too much headache.

modules/hetzner/kubernetes/variables.tf

@@ -0,0 +1,49 @@
+variable "name" {
+  type = string
+}
+
+variable "ssh_keys" {
+  type = list(string)
+}
+
+variable "servers" {
+  type = list(object({
+    ipv4_id  = number
+    ipv6_id  = number
+    type     = string
+    location = string
+  }))
+}
+
+variable "agents" {
+  type = list(object({
+    count    = optional(number, 1)
+    type     = string
+    location = string
+  }))
+}
+
+variable "ping_enabled" {
+  type = bool
+  default = true
+}
+
+variable "public_tcp_services" {
+  type = map(list(string))
+  default = {}
+}
+
+variable "kubernetes_exposed_ips" {
+  type = list(string)
+  default = []
+}
+
+variable "ssh_exposed_ips" {
+  type = list(string)
+  default = []
+}
+
+variable "ssh_port" {
+  type = number
+  default = 1022
+}