migrate Configuration usage to Settings
Created by: bobheadxi
closes https://github.com/sourcegraph/sourcegraph/issues/10419
looks like ConfigurationSubject
was removed a while back, and SettingsSubject
has replaced it
SettingsSubject is something that can have settings: a site ("global settings", which is different from "site configuration"), an organization, or a user.
go build ./cmd/src
./src config list
./src config get
a variety of other Configuration
-related fields have been listed as deprecated, so I've gone ahead and migrated them to use Settings