Gitlab flow is broken due to `git read-tree --prefix=/`

**Describe the bug**

The fix applied in #53 needs to be applied for setting up gitlab projects

**Steps to reproduce**

run `bash setup.bash --gitlab`, and answer the questions

it will fail with a message similar to `fatal: Invalid prefix, prefix cannot start with '/'`

after applying a similar fix, it resolved the issue

**Expected behavior**

for the setup to work :)

Inspect setup.bash and compare its GitLab project setup with the fix applied in issue #53. Reproduce the failure with `bash setup.bash --gitlab`, then verify that setup completes without the `Invalid prefix` error.

Written by the indexing model from the issue text.