* 🎨🔥 do not store settings in config and make settings cache easier available
- remove remembering settings value in theme config
- if we need a cache value, we are asking the settings cache directly
- instead of settings.getSettingSync we use settings.cache.get
- added TODO:
- think about moving the settings cache out of api/settings
- we could create a folder named cache cache/settings
- this settings cache listens on model changes for settings
- decoupling
* 🔥 remove timezone from config
- no need to store in overrides config and in defaults settings
* 🎨 context object helper
- replace config.get('theme') by settings cache
* 🎨 replace config.get('theme') by settings.cache.get
* 🎨 adapt tests
* fixes from comments
refs #5942
- refactor ghost_head to use Promise.props (settle is going away and this is easier)
- add a new call to fetch the frontend client, if it exists
- add meta tags for the client_id and client_secret on all pages
- don't include the meta tags if the client is not enabled, or if the labs flag is not set
issue #5976
- break out the labs check into a utility
- wrap the get helper in a labs check, so it only works if the checkbox is checked
- make the get helper output an error to both the server and browser console if used when not enabled