* CLI tool to rename file or tree
* it works
* progress
* progress
* wip
* wip
* wip
* debugging
* fixed
* remove console logging
* add support for also updating learning-tracks
* cope with the 'children' key in the root content/index.md unicorn
* update childGroups too
* guardrails
* refactor
* tidying up arguments
* refactored for single files
* nicer error in pre-validation of the first file argument
* regression fix
* fix for moving directories
* delete lib/redirects/.redirects-cache.json if present
