closes#10643
The async resolver in express-hbs relies on storing the state of the
promises on the `this` value inside of a helper, which is always set to
the `context`. This patch updates our helpers which render templates, to
use `this` as the context when rendering their templates.
refs #10790
- Moved /core/apps into core/frontend
- Moved /core/server/helpers to /core/frontend/helpers along with /core/server/services/themes
- Changed helper location in overrides
- Moved /core/server/services/routing to /core/frontend/services
- Moved /core/server/services/url to /core/frontend/services
- Moved /core/server/data/meta to /core/frontend/meta
- Moved /core/server/services/rss to /core/frontend/services
- Moved /core/server/data/xml to /core/frontend/services
- moved template logic out of individual helpers and into Ghost
- simplified template-driven helpers into closures which maintain the context of handlebars
- with handlebars context we have access to data, so don't need to pass data in
- check data to test that it is a simple object and not a function
- moved helpers back into index.js
- provided tests for both template functions in ghost and the nav helper so we are back to where we were
- updated navigation and pagination helpers to use SafeString
- nav and pagination don't need triple taches any more
- nav tests updated, and renamed to match helper name
- renamed helper from ghostNav to nav and file from ghostNav to navigation
- switched template to use current-menu-item as per the styles
- cleaned up several unused items from config, and removed default link to admin
- updated tests
