refs https://github.com/TryGhost/Team/issues/1599
- adds `portal_*` settings to public settings endpoint
- adds calculated `firstpromoter_account` setting for public settings endpoint
- also adds Ghost `version` information
refs: https://github.com/TryGhost/Toolbox/issues/327
- lang / locale has had a lot of churn, but we decided this setting should always be locale
- session_secret is too generic as we have multiples of these
refs: https://github.com/TryGhost/Team/issues/626
- calculated settings are simplified settings (booleans) that are based on other settings or data
- they make it easier for us to determine what state features are in elsewhere in ghost e.g. admin and themes
- this duplicates some of the members config concepts in the settings service
refs: e68cb8b314
- a couple of months ago when improving the test coverage here I found some weird behaviour with falsey values
- turned out it didn't matter at the time because we didn't have any settings that are false
- with the introduction of calculated settings we will have: https://github.com/TryGhost/Ghost/pull/14766
- whilst building that, I found settings that should be returned as false were being returned as null
- fixing it in a separate commit to keep the work clean
- settings cache was appearing as untested because we use rewire!
- rewire was totally unnecessary in this case, so I removed it
- updated to 100% test coverage whilst there, including removing one unreachable branch
- commented some undesirable behaviour I found whilst trying to reach all branches
- I don't want to change the behaviour to return false correctly without having a reason beyond improving coverage
- This is part of the quest to separate the frontend and server & get rid of all the places where there are cross-requires
- At the moment the settings cache is one big shared cache used by the frontend and server liberally
- This change doesn't really solve the fundamental problems, as we still depend on events, and requires from inside frontend
- However it allows us to control the misuse slightly better by getting rid of restricted requires and turning on that eslint ruleset
