docs(preset-nitro): update configuration steps and improve clarity

[jcbsfilho]

This pull request significantly reorganizes and clarifies the documentation for the Azion Nitro preset, focusing on improving the setup instructions, streamlining deployment details, and removing redundant or overly detailed sections. The changes make it easier for developers to get started and understand the integration process.

Documentation improvements and reorganization:

• Reorganized the setup instructions into clear, step-by-step sections for installing dependencies and configuring the preset, including explicit installation commands for multiple package managers.
• Updated the project reference section to highlight the template's basis and features, and removed redundant configuration examples for generic Nitro apps.

Deployment and workflow clarification:

• Simplified the deployment workflow section, clarifying the build and deployment steps and updating terminology to be more general (e.g., "Azion's network" instead of "Azion's edge network"). [1] [2]
• Removed technical implementation details about Nitro's output directories and runtime, focusing instead on user-facing features and steps.

Removal of redundant sections:

• Removed the example project structure and troubleshooting sections to streamline the documentation and focus on essential setup and usage information.

[github-actions]

SCC Complexity Analysis

• Title: docs(preset-nitro): update configuration steps and improve clarity
• Author: jcbsfilho

Metric	Source Branch (doc/nitro-preset)	Target Branch (main)	Difference
Complexity	2445	2445	0
Code	50506	50528	-22