how to delete a branch in git remote repository code example
Example 1: Delete a Git Branch In Local And Remotely
git push <remote_name> --delete <branch_name>
Example 2: How to Delete Local/Remote Git Branches
$ git branch -a
# *master
# b1
# remote/origin/master
# remote/origin/b1
$ git push origin --delete b1
# [...]
# - [deleted] b1