Private Dashboards

As a Checkly administrator I would like to create private dashboards (View only TV mode style) and share them with third parties using individual username/password or other secure methods that ensure the dashboards are only viewable by authorised users.

These users should not count towards the "employee or user" count for billing but may be bundled as part of billing packages.

original GH issue link https://github.com/checkly/public-roadmap/issues/23