Replacing docker-compose with Nix for development

Ever since the author started using Nix for development, the project relied on external services like databases and message brokers, leading to the use of Docker. However, to simplify the setup and reduce system resource consumption, the author decided to replace Docker with Nix in the project. A new solution, services-flake, was introduced to manage project-specific services natively and cross-platform. This solution addressed the need to run multiple instances of the same service and ensured data locality for each service.