Git remove directory
This is what I use, and I think you'll want to as well. It's close to the other answers, but instructs git to NOT change the local files.
git rm -r -f --cached DirectoryName- -r : recursive
- -f : force
- --cached : apply ONLY to index (staging area). Git leaves the local copies alone.
Git does not store any information about the directory, just the files within it. So, you cannot add or remove directories themselves; if you say git add images, Git will add all of the files within that directory (that don't match the ignore list).
Generally, the only way for there to be an empty directory is if it actually contains a file, usually a hidden file like .gitignore.
You said that you see an images directory on GitHub, but I'm not seeing it in the repo that you linked to. Are you sure it's there, and not just an empty directory on your disk? If it's just an empty directory on your disk, you can just remove it using rm images; Git doesn't need to know about it.