refs https://github.com/TryGhost/Team/issues/510
- When the host config was introduced it was incorrectly introduced as host_settings instead of hostSettings
- All other Ghost config uses camelCase, so changing this now before it becomes a problem
- Note: Also removed some rogue return awaits that don't make sense. It's not possible to hit that case, but cleaning up anyway
refs https://github.com/TryGhost/Ghost/issues/12608
- adds `admin/canary/themes/install` endpoint to the Admin API
- requires two query params. `source` must be set to "github". `ref` should refer to a GitHub repo in the format "{org}/{repo}"
- downloads zip archive for the repo from github
- runs downloaded zip through the same process as uploaded zips
* refactored `core/frontend/apps` to destructure common imports
* refactored `core/frontend/services/{apps, redirects, routing}` to destructure common imports
* refactored `core/frontend/services/settings` to destructure common imports
* refactored remaining `core/frontend/services` to destructure common imports
* refactored `core/server/adapters` to destructure common imports
* refactored `core/server/data/{db, exporter, schema, validation}` to destructure common imports
* refactored `core/server/data/importer` to destructure common imports
* refactored `core/server/models/{base, plugins, relations}` to destructure common imports
* refactored remaining `core/server/models` to destructure common imports
* refactored `core/server/api/canary/utils/serializers/output` to destructure common imports
* refactored remaining `core/server/api/canary/utils` to destructure common imports
* refactored remaining `core/server/api/canary` to destructure common imports
* refactored `core/server/api/shared` to destructure common imports
* refactored `core/server/api/v2/utils` to destructure common imports
* refactored remaining `core/server/api/v2` to destructure common imports
* refactored `core/frontend/meta` to destructure common imports
* fixed some tests referencing `common.errors` instead of `@tryghost/errors`
- Not all of them need to be updated; only updating the ones that are
causing failures
* fixed errors import being shadowed by local scope
