docs/data/reusables/pages/remove-submodule.md

To troubleshoot, first decide if you actually want to use a submodule, which is a Git project inside a Git project; submodules are sometimes created accidentally.

If you don't want to use a submodule, remove the submodule, replacing PATH-TO-SUBMODULE with the path to the submodule:

$ git submodule deinit PATH-TO-SUBMODULE
$ git rm PATH-TO-SUBMODULE
$ git commit -m "Remove submodule"
$ rm -rf .git/modules/PATH-TO-SUBMODULE