Properly apply editorconfig settings to all yaml files

[PanisSupraOmnia]

Previously, the editorconfig file contained a section for yaml files, but it only included *.yml files, which meant that it wasn't being used outside of the GitHub Actions config. This PR applies the editorconfig to *.yml, *.yaml, and *.yaml.example, and applies the correct indentation to those yaml files.

[svpernova09]

Thanks for the PR

[simonschaufi]

why is this not merged yet?

[svpernova09]

why is this not merged yet?

There's a lot in the pipeline and I've not had the time to dedicate to sit down and go through it all properly yet.