Draft: Add script to find a deleted term with git bisect

Git{Hub|Lab} UIs are fine for finding added content by clicking through, see https://docs.gitlab.com/ee/user/project/repository/git_blame.html

But deleted lines can not be found manually that way, because they have no prior/previous button one could click.

This was for example useful to prepare gitlab-org/gitlab!140367 (merged) & gitlab-org/gitlab!139894 (merged).