- now we only have one API version, it doesn't make sense to keep
"canary" around
- renaming it to `endpoints/` makes more sense for this
- this commit renames the `core/server/api/canary/` folder to
`core/server/api/endpoints/`
- it also fixes the naming in test titles and the various other places
we relied on this
refs https://github.com/TryGhost/Toolbox/issues/169
- Before releasing Ghost v5 we would like to move all canary-related URLs to a non-versioned format, which will become a default in v5.
- 'canary' is by definition unstable, so breaking any unprepared client explicitly using the canary is expected
- Removed the aliased /content/ and /admin/ apps from app.js because with updated configuration they become duplicates of 'canary' endpoints