Incorporate welcome email info into docs

Moved from https://github.com/uabrc/uabrc.github.io/issues/285

Subject:
Your cloud.rc S3 account is ready!

Body:
Your Research Computing Long Term Storage S3 account is now available. Your account has a 5TB limit.

You can use the service with the Access Key and Secret Key found at this link: {link-to-box-note}

Please note: We do not currently have user self-service available for this service, so you will not be able to change your access and secret keys yourself. If you would like to change them, please let us know at support@listserv.uab.edu.

Configuration settings you will need:
region: default
endpoint: https://s3.lts.rc.uab.edu/
S3 provider: Ceph Object Storage

We have documentation available to help get you started at https://uabrc.github.io/data_management/lts/lts/

You can use any client that is compatible with the Amazon S3 API. Some examples we have used in Research Computing are rclone, S3cmd, AWS CLI, AWS SDK for Python (Boto3), etc.

Please note this service is currently only available from campus and VPN networks.

Let us know if you have any problems or questions by emailing us at support@listserv.uab.edu

Start by reading the LTS documentation at https://uabrc.github.io/data_management/lts/lts/ and compare it with the welcome email details in this issue. Update the relevant documentation with the account limit, access-key guidance, configuration settings, supported clients, and campus/VPN restriction; it is done when the documented setup matches the email.