fix(vpc): update VPC module for availability zone handling - #123

Description

Update the VPC module to improve availability zone handling by introducing a max_availability_zones variable. Adjust the README to reflect the new default for non-production VPCs.

Context

This change allows for more flexible configuration of availability zones, enabling users to specify a maximum number of zones for their VPCs. It addresses the need for better control over resource allocation in different environments.

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

Sensitive Information Declaration

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.