close #14: Remove _DS_Store files

[frebro]

This removes all files named _DS_Store from the repo.

[Conan-Kudo]

@frebro you may want to also add them to the .gitignore so they don't show up again.

[frebro]

I considered doing that, but then decided against it. .DS_Store is the actual name for those kinds of files, and that is already in .gitignore. I’m not sure how these got renamed _DS_Store in the first place, but assuming it was a one-time mistake one could safely omit them from the ignore list. My opinion.