Add documentation for configuring CI/CD after forking

[Copilot]

After forking the repository, users who want to enable Continuous Deployment need to run azd pipeline config to configure the required Azure credentials and GitHub secrets. This was not documented anywhere, leaving users without guidance on how to set up CI/CD for their forked repositories.

Changes Made

• Added a new "Enable CI/CD (Optional)" section in docs/readme.md
• Documented the azd pipeline config command and its purpose
• Explained the step-by-step process for configuring CI/CD after forking
• Positioned the section logically between repository setup and deployment instructions

Documentation Structure

The new section includes:

1. Prerequisites (Azure Developer CLI installation)
2. Authentication steps (azd auth login)
3. Pipeline configuration command (azd pipeline config)
4. Explanation of what the command accomplishes
5. Clarification on when automatic deployments will occur

This aligns with the existing GitHub Actions workflow comment that mentions the same command and provides users with clear, actionable guidance.

Fixes #111.

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