docs(terraform): add best practice recommendation to README for AKS cluster configuration and networking feat(terraform): implement separate VNets for each AKS cluster as a best practice

[robinmordasiewicz]

Focuses on two key changes:

1. Documentation Enhancement:

   • Added a best practice recommendation to the README.md file for configuring AKS clusters and networking. It emphasizes separating each cluster into different VNets and avoiding creating multiple clusters in the same subnet. This addition aims to improve clarity and adherence to best practices for AKS configuration.

2. Infrastructure Implementation:

   • Implemented separate VNets for each AKS cluster as a best practice. This change involves defining separate subnet configurations for AKS clusters within the terraform files. By segregating the clusters into distinct VNets, the infrastructure setup follows a more secure and scalable approach.

These changes align with industry best practices and aim to enhance the project's overall architecture and maintainability.