fix small issues with docker setup sh

Makefile

@@ -49,6 +49,7 @@ docker-run:
 
 .PHONY: docker-cert
 docker-cert: clean-certs ## Create SSL certificates for server
+	mkdir -p certs/
 	OSCAR_HOST=$(OSCAR_HOST) docker compose run --no-TTY --rm cert-gen
 
 .PHONY: docker-nss

docker-setup.sh

@@ -97,7 +97,7 @@ Next Steps:
 ${YELLOW}127.0.0.1 $OSCAR_HOST${NC}
 ${GREEN}
 3. For AIM 6.x client setup instructions, see:
-   https://github.com/mk6i/retro-aim-server/blob/main/AIM6.md#aim-6265312-setup
+   https://github.com/mk6i/retro-aim-server/blob/main/docs/AIM6.md#aim-6265312-setup
 
 Enjoy!
 ${NC}"