no issue
- adapt major changes of knex-migrator v3
- adapt migration scripts, simplify and add `down` (rollback) hook if possible
- clear Ghost cache after init hook (because of `knex-migrator migrate --init`)
- ensure db migrations work with the CLI
- updated troubleshooting guide (https://docs.ghost.org/v1/docs/troubleshooting#section-task-execute-is-not-a-function)
**For development only: Please ensure you run `npm i -g knex-migrator@latest` to update your global installation to v3. We always prefer the local installation, but v3 has modified and added binaries.**
closes#9060
- Update `gscan` - it now extracts custom templates and exposes them to Ghost
- Add `custom_template` field to post schema w/ 1.13 migration
- Return `templates` array for the active theme in `/themes/` requests
- Users with Author/Editor roles can now request `/themes/`
- Front-end will render `custom_template` for posts if it exists, template priority is now:
1. `post/page-{{slug}}.hbs`
2. `{{custom_template}}.hbs`
3. `post/page.hbs`
