cmd structure is odd/confusing

[cwedgwood]

the cmd structure is confusing at best

think about updating that to be more flexible

perhaps so we can do

docker run cedgwood/certbot-aws certbot renew
docker run cedgwood/certbot-aws aws

and later on

docker run cedgwood/certbot-aws help
docker run cedgwood/certbot-aws configure

[cwedgwood]

note:

$ sudo docker inspect cwedgwood/certbot-aws:v0.22.2 | jq -c '.[0].Config | [ .WorkingDir , .Entrypoint ]'
["/opt/certbot",["certbot"]]

is where it's current behavior stems from. replacing that with a simple wrapper might be easiest.