Add comprehensive FAQ documentation for finding original GitHub Copilot requests

[Copilot]

Problem

Users frequently ask "Where do I find the initial full request that I made to Copilot with the instructions for this PR?" when working with GitHub Copilot-generated pull requests. This is a common pain point as the original context can be scattered across multiple locations in GitHub's interface.

Solution

This PR adds comprehensive documentation to help users locate their original Copilot requests through multiple channels:

🆕 New FAQ Documentation (FAQ.md)

Created a detailed FAQ section specifically addressing Copilot integration questions, including:

• 7 different methods to find original Copilot requests:

  1. GitHub Issues tab (open and closed)
  2. Pull Request descriptions and comments
  3. GitHub notifications and email alerts
  4. Browser history
  5. GitHub activity feed
  6. Copilot interface history
  7. Repository discussions

• Pro tips for better request tracking in the future

• Common usage questions about the Loom Video Downloader extension

• Technical documentation references

📖 Enhanced README

• Added prominent callout box immediately visible to users looking for their original requests
• Updated links section to prominently feature the new FAQ
• Enhanced table of contents to include FAQ and technical documentation
• Improved discoverability of help resources

🎯 Key Features

> 💡 Looking for your original Copilot request? 
> Check out our FAQ section for detailed guidance on where to locate your original instructions.

The documentation provides actionable, step-by-step guidance that users can follow immediately when they encounter this common issue.

Impact

• Reduces support burden by providing self-service documentation
• Improves user experience for GitHub Copilot interactions
• Establishes documentation pattern for future Copilot-related questions
• Enhances repository structure with professional FAQ organization

This addresses the exact question raised in the original issue while providing a comprehensive resource for similar future questions.

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