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/versions.tf

@@ -0,0 +1,14 @@
+terraform {
+  required_providers {
+    hcloud = {
+      source = "hetznercloud/hcloud"
+      version = "1.50.0"
+    }
+    random = {
+      source = "hashicorp/random"
+      version = "3.7.1"
+    }
+  }
+}
+
+