remove cert-gen script (nginx#5583)

Makefile

@@ -93,10 +93,6 @@ telemetry-schema: ## Generate the telemetry Schema
 	go generate internal/telemetry/exporter.go
 	gofumpt -w internal/telemetry/*_generated.go
 
-.PHONY: certificate-and-key
-certificate-and-key: ## Create default cert and key
-	./build/generate_default_cert_and_key.sh
-
 .PHONY: build
 build: ## Build Ingress Controller binary
 	@docker -v || (code=$$?; printf "\033[0;31mError\033[0m: there was a problem with Docker\n"; exit $$code)

docs/content/installation/building-nginx-ingress-controller.md

@@ -165,7 +165,6 @@ A few other useful targets:
 | _push_                              | Pushes the built image to the Docker registry. Configures with `PREFIX` and `TAG`.  |
 | _all_                               | Runs `test`, `lint`, `verify-codegen`, `update-crds`, and `debian-image`. Stops and reports an error if any of these targets fail.  |
 | _test_                              | Runs unit tests.  |
-| _certificate-and-key_               | NGINX Ingress Controller requires a certificate and key for the default HTTP/HTTPS server. You have several options: <ul><li>Reference them in a TLS Secret in a command-line argument to NGINX Ingress Controller.</li><li>Add them to the image in in a file in PEM format as `/etc/nginx/secrets/default`.</li><li>Generate a self-signed certificate and key with this target.</li></ul>Note, you must include the `ADD` instruction in your Dockerfile to copy the cert and key to the image. |
 {{</bootstrap-table>}}
 
 ### Makefile variables you can customize {#makefile-variables}