* remove submodules

* remove graph plugin

* remove graph plugin from configs and texts

* Introduce concept of networks

* Adjust tests to use flexible Docker networks

* Adjust test execution workflow

* Separately build GoShimmer Docker image

* Generate identities to create containers from seeds

* Move Docker network functionality

* Add comments and docs

* Update readme

* Update readme

* Address PR comments

* Use log instead of fmt

* Introduce proper error handling

* Use named return for error