Fixed renovate config
Fixed renovate config

refs https://github.com/TryGhost/Admin/commit/c1ecb6a572d27f1570e71a28d817d1f33805d037
refs https://github.com/TryGhost/Admin/pull/1830

- using `renovate-config-validator` it appears Renovate doesn't support extends within packageRules or at least requires direct selectors rather than extended selectors
- copied package rules from `@tryghost:pkgCSS` across rather than using `extends`

TryGhost/Ghost,TryGhost/Ghost,TryGhost/Ghost