This option allows for all alerts for a specified receiver, or list of
receivers, to be removed from unsee.
My use case for this is using a receiver for auto-remediation which will
contain information that the user will never need to see in the UI.
Internal packages are supported by Go 1.5+, any package in /internal/ dir is only importable from the same repo. This will cleanup main dir a bit and provide better namespace for unsee subpackages
