Revise `hide` command.
Hiding initializes a dependency by creating it's config file in the `dep_config` directory. Instead of naming the config file `ambassade.json`, the file will be named '<dependency name>.json'.
The actual initialization hasn't been implemented yet.
The `backend::dep_config::scan()` function can search for config files in a dependency directory and in `dep_config` (NOT in the project's root directory!).