Lumosviridi v20 kubernetes updates (#6356)

Updates for v20+ and misc terraform bug fixes. Also refactored to use
terraform variables instead of locals which helps with readability and
ease of use for new users.

Terraform validation is currently passing:
![Screenshot 2024-07-21 at 13 18
37](https://github.com/user-attachments/assets/02aadc2d-d3f6-4e8b-9315-64e25191d9e6)

Additionally added [terraform-docs](https://terraform-docs.io/) to
generate a more helpful README for terraform specific configuration.

Raw K8s manifests were updated with changes for v20+ as well.

---------

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-docker/k8s/terraform/pv-server.tf

@@ -1,18 +1,18 @@
 resource "kubernetes_persistent_volume" "server" {
   metadata {
-    name = "${local.twentycrm_app_name}-server-pv"
+    name = "${var.twentycrm_app_name}-server-pv"
   }
   spec {
     storage_class_name = "default"
     capacity = {
-      storage = local.twentycrm_server_pv_capacity
+      storage = var.twentycrm_server_pv_capacity
     }
     access_modes = ["ReadWriteOnce"]
-    # refer to Terraform Docs for your specific implementation requirements 
+    # refer to Terraform Docs for your specific implementation requirements
     # https://registry.terraform.io/providers/hashicorp/kubernetes/latest/docs/resources/persistent_volume
     persistent_volume_source {
       local {
-        path = local.twentycrm_server_pv_path
+        path = var.twentycrm_server_pv_path
       }
     }
   }