documentation fix: "ignore_paths" vs "ignore*D*_paths"

[jhartman86]

In the Readme, the documentation has "ignore_paths" in the YAML example, while it seems Realize is actually looking for "ignored_paths" as the key (per the JSON parsing annotations in https://github.com/oxequa/realize/blob/bcf8507c0bd7d33f54a8223c9e8fa1fd3e4a4555/realize/projects.go#L34).