reduce features in aws-config

[syphar]

$ cargo tree | wc -l
    2672
$ git checkout less-aws-config
Switched to branch 'less-aws-config'
$cargo tree | wc -l
    2639

I initially wasn't sure if one of them is how we authenticate on the server. But it's not.

[GuillaumeGomez]

Dependencies removal! \o/

[syphar]

Dependencies removal! \o/

removing the cloudfront SDK also helped already