title: Definitively delete the tracking of .DS_Store files in GIT
body: <p>I've a git repo where <code>.DS_Store</code> files are already tracked. Is there a way to completely ignore theme in every folder?</p>
  
  <p>I know that before being tracked I can simply put <code>.DS_Store</code> in <code>.gitignore</code>, but I also know that it doesn't work if <code>.DS_Store</code> are already versioned.</p>