Refactors docs. Closes: #491

[Adam-it]

🎯 Aim

The aim of this PR is to refactor docs

📷 Result

✅ What was done

• Added scenarios - here I rather only added a menu placeholder as we did not record any updated scenario yet
• Added features section with
  • Welcome experience and walkthrough
  • GH Copilot capabilities
  • Actions
  • Management capabilities
  • CI/CD workflow
  • Coding
  • Better Together
• Added contributing guide
• Added Technical insights - here I am still planning to add something about how the extension authenticates to user tenant
• Added About with:
  • Changelog
  • Meet the Team
  • Telemetry
  • Marketing Resources
  • License
  • Code of Conduct
  • Disclaimer

🔗 Related issue

Closes: #491

[Adam-it]

@Saurabh7019 since I noticed you are working on the create new project pages based on scaffolding form and sample gallery, I left some todos in the index.mdx page, readme, introduction component, and the navigation which will need to get merged with your work and aligned