refactor: remove submodules #29

# to view logs

Job	Run time
build-and-push-images (neo4j, neo4j, neo4j/Dockerfile, community)	23s
build-and-push-images (backend-base, backend, backend/Dockerfile, base)	35s
build-and-push-images (backend-build, backend, backend/Dockerfile, build)	37s
build-and-push-images (backend, backend, backend/Dockerfile, production)	2m 49s
build-and-push-images (webapp-base, webapp, webapp/Dockerfile, base)	1m 9s
build-and-push-images (webapp-build, webapp, webapp/Dockerfile, build)	44s
build-and-push-images (webapp, webapp, webapp/Dockerfile, production)	4m 30s
build-and-push-images (maintenance-base, webapp, webapp/Dockerfile.maintenance, base)	22s
build-and-push-images (maintenance-build, webapp, webapp/Dockerfile.maintenance, build)	36s
build-and-push-images (maintenance, webapp, webapp/Dockerfile.maintenance, production)	2m 8s
	13m 53s

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