ReadMe Git Harvester Example Bug

There is a discrepancy between the ReadMe file and the code, causing the hmc-unhide harvester command to fail. Specifically, the ReadMe instructs users to run the harvester for GitLab repositories using the name gitlab:

hmc-unhide harvester run --name gitlab --out ~/work/data/gitlab_pipeline

However, in the code, the correct name for GitLab repositories is defined as git.

We need to change one source, either the ReadMe or the Code.