Show branches that don't exist at remote origin
anymore.
clear-counter 012345678 [gone] fix: Allow user to clear counter value
404-page 9abcdef01 [gone] feat: Add 404 page
git remote prune origin
git branch -v | grep gone
git config --global alias.trim '!git remote prune origin && git branch -v | grep gone'
git trim
git config --global --unset alias.trim