Resolves#1732. This separates out the use cases into three audiences:
administrators who configure UCP and HRM, users who use the web UI, and
users who use the Docker CLI or API. The CLI reference also provides a
guide to the label syntax and the full set of features.
* Update screenshots for /datacenter/install/aws/
* Update screenshots for datacenter/install/linux/
* Update screenshots for datacenter/ucp/2.1/guides/
* Update screenshots for datacenter/ucp/2.1/guides/admin/install/
* Update screenshots for datacenter/ucp/2.1/guides/admin/configure/scale-your-cluster/
* Fix screenshot's text in /ucp/2.1/guides/admin/install/
* Update screenshots for datacenter/ucp/2.1/guides/admin/configure/scale-your-cluster/
* Update screenshots for /datacenter/ucp/2.1/guides/admin/monitor-and-troubleshoot/
* Update screenshot for /datacenter/ucp/2.1/guides/admin/monitor-and-troubleshoot/troubleshoot-with-logs/
* Update screenshot for /datacenter/ucp/2.1/guides/user/access-ucp/
* Update screenshots for /datacenter/ucp/2.1/guides/user/services/
* Update screenshots for /datacenter/ucp/2.1/guides/user/secrets/
* Update screenshots for /datacenter/install/aws/
* Update screenshots for datacenter/install/linux/
* Update screenshots for datacenter/ucp/2.1/guides/
* Update screenshots for datacenter/ucp/2.1/guides/admin/install/
* Update screenshots for datacenter/ucp/2.1/guides/admin/configure/scale-your-cluster/
* Fix screenshot's text in /ucp/2.1/guides/admin/install/
* Update screenshots for datacenter/ucp/2.1/guides/admin/configure/scale-your-cluster/
* Update screenshots for /datacenter/ucp/2.1/guides/admin/monitor-and-troubleshoot/
* Update screenshot for /datacenter/ucp/2.1/guides/admin/monitor-and-troubleshoot/troubleshoot-with-logs/
* Update screenshot for /datacenter/ucp/2.1/guides/user/access-ucp/
* Update screenshots for /datacenter/ucp/2.1/guides/user/services/
* Update screenshots for /datacenter/ucp/2.1/guides/user/secrets/