Shenanigans with submodules

Adding a submodule (creates a submodule config file):

git submodule add repository-url

When you clone a project with a subdirectory (initialise the submodule config file and fetches all of the data associated with the project):

git submodule update --init --recursive

Removing a submodule:

1. Delete the line referring to the submodule in the .gitmodules file.
2. Delete the section referring to the submodule from .git/config.
3. git rm -cached module_path
4. Commit
5. rm -rf module_path