* Rename SiteConfig
* More renaming
* Update spec
* Update mandatory settings mapping
* More renaming
* e2e test fixes
* You have a rename, and you have a rename
* Spec fix
* More changes
* Temporarily disable specs
* After-merge update
* Undo rename for migration
* undo rename of DUS
* Fix DUS
* Fix merge problem
* Remove redundant DUS
* Fix specs
* Remove unused code
* Change wrong class name
* More cleanup
* Re-add missing values to constant
* Fix constant
* Fix spec
* Remove obsolete fields
* Add accidentally removed field
* Update spec
* Move methods from Settings::General to ForemInstance
* Remove unneeded model
* Change mentions of 'site config'
* Adds a new admin setting for experience levels.
This is used in the post management UI to determine the range of experience. These values fallback to the ones we currently see in DEV, Total Newbies and Senior Devs. There is also a removal of the word coding when talking about experience level, since the context for each forem instance should be implied when referencing experience.
* Cleans up experience defaults
* Fixes instance_of usage
