removal(mok): Strip down postfix image

charts/mok/README.md

charts/mok/templates/secret.yaml

charts/mok/tests/__snapshot__/domains_test.yaml.snap

charts/mok/tests/__snapshot__/dovecot_test.yaml.snap

charts/mok/tests/__snapshot__/postfix_test.yaml.snap

charts/mok/tests/__snapshot__/relay_test.yaml.snap

charts/mok/tests/dovecot_test.yaml

charts/mok/tests/postfix_test.yaml

charts/mok/values.yaml

images/postfix/.release

images/postfix/Earthfile

images/postfix/config/.gitignore

images/postfix/config/header_checks

images/postfix/config/main.cf

images/postfix/config/master.cf

images/postfix/docker/rsyslog.conf

images/postfix/docker/start.sh

images/postfix/docker/supervisord.conf