Enhance Copilot instructions module by adding a step to Generate Instructions with Copilot

[tspascoal]

Add a step for the user to improve the instruction file using Copilot Generate Instructions capability

Add two IaC examples from copilot-awesome so users can see more elaborate instruction files
Added a reference to copilot-awesome repo

New best practice instruction files:

• Added .github/instructions/bicep-code-best-practices.instructions.md with detailed conventions for Bicep Infrastructure as Code, covering naming, structure, parameters, variables, resource references, security, and documentation.
• Added .github/instructions/terraform-azure.instructions.md with comprehensive Azure Terraform guidance, including DevOps principles, anti-patterns, code organization, AVM usage, secrets management, outputs, folder structure, Azure-specific practices, cost management, state management, and validation.

Documentation improvements for Copilot instructions:

• Updated content/1-hour/3-copilot-instructions.md to add a section on using Copilot to generate or improve instructions, and to explain the use of specialized instructions files in .github/instructions for technology-specific best practices.
• Added a reference link to the [github/awesome-copilot] repository for users seeking example instructions files.

[Copilot]

Pull Request Overview

This PR enhances the Copilot instructions module by adding comprehensive guidance on using Copilot's Generate Instructions capability and expanding the documentation with specialized Infrastructure as Code examples.

• Adds a new section on using Copilot to generate or improve instructions files
• Introduces two new specialized instruction files for Bicep and Terraform Azure best practices
• References the github/awesome-copilot repository for additional examples

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
content/1-hour/3-copilot-instructions.md	Added section on generating instructions with Copilot and documentation for specialized instructions files
.github/instructions/terraform-azure.instructions.md	New comprehensive Terraform Azure best practices instruction file with DevOps principles and security guidelines
.github/instructions/bicep-code-best-practices.instructions.md	New Bicep Infrastructure as Code instruction file covering naming, structure, and security conventions

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