Ignoring is only useful for files that are not currently being tracked by the repo. If those directories were added to the repo before being put in .gitignore, they will continue to be tracked.
Use git rm --cached <file>
to stop tracking a file.
Of course you should make a commit with the removed files and push to the repo to see the changes in the remote repository
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…