use mkcert everywhere, document dep

Author: Oppen

Makefile

@@ -306,7 +306,7 @@ batcher_start: ./batcher/aligned-batcher/.env user_fund_payment_service
 
 batcher_create_self_signed_cert:
 	@echo "Creating TLS certificate for localhost"
-	@openssl req -x509 -days 1825 -newkey rsa:2048 -keyout rootCA.key -out rootCA.crt -nodes -subj '/CN=localhost'
+	@mkcert -install -cert-file rootCA.crt -key-file rootCA.key localhost
 	@echo "TLS certificate created"
 
 batcher_start_local: user_fund_payment_service batcher_create_self_signed_cert

docs/3_guides/6_setup_aligned.md

@@ -9,6 +9,7 @@ Ensure you have the following installed:
 - [Foundry](https://book.getfoundry.sh/getting-started/installation)
 - [jq](https://jqlang.github.io/jq/)
 - [yq](https://github.com/mikefarah/yq)
+- [mkcert](https://github.com/FiloSottile/mkcert)
 
 After installing foundryup, you need to install a specific Foundry version: