Add AWS region for api publishing

[aaronjudd]

• While working w/o locally, region is needed on circleci
• tested via ci ssh
• adds API_DOC_BUCKET, API_DOC_BUCKET_REGION to env variables for CircleCI

[aaronjudd]

@jshimko @spencern I believe this is good to merge direct to master. While aws s3 sync works locally, on CircleCI it needed region to be supplied as an option --region otherwise the command returns a warning. Updated both the bucket and region to be env variables as well. Tested via CI SSH.

[spencern]

@aaronjudd how can I test this? Code looks good and makes sense, do we need to put ENV vars into CircleCI or do I supply them from my local?

[aaronjudd]

Really only one way to truly test.