Apply CGL consistently in .yaml files
The CGL page for Yaml files has been added: https://docs.typo3.org/typo3cms/CoreApiReference/CodingGuidelines/CglYaml.html
The indenting with 2 spaces appears to be applied consistently in the core, but using double quotes ("") or ('') for strings is not.
- sites: generated config.yaml
- ... all others I checked.