Como substituir o RSA 4096 bits do Let's Encrypt por ECC 256 bits?

@mpalmer does this request make sense to you? Is there anything off with our current certificate config in NGINX?

OK per https://www.ssl247.com/kb/ssl-certificates/generalinformation/what-is-rsa-dsa-ecc ECC is latest and greatest, so I guess we should at least document how to do this. Not sure.