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/ingress.tf

@@ -1,7 +1,7 @@
 resource "kubernetes_ingress" "twentycrm" {
   wait_for_load_balancer = true
   metadata {
-    name      = "${local.twentycrm_app_name}-ingress"
+    name      = "${var.twentycrm_app_name}-ingress"
     namespace = kubernetes_namespace.twentycrm.metadata.0.name
     annotations = {
       "kubernetes.io/ingress.class"                       = "nginx"
@@ -15,7 +15,7 @@ resource "kubernetes_ingress" "twentycrm" {
   spec {
     ingress_class_name = "nginx"
     rule {
-      host = local.twentycrm_app_hostname
+      host = var.twentycrm_app_hostname
       http {
         path {
           path = "/*"