docs: enhance contribution workflow for different GitHub accounts

[Copilot]

This PR addresses the common question "how to clone this repo and branch on another account" by significantly enhancing the contribution documentation to provide clear, step-by-step guidance for contributors using different GitHub accounts.

What's Changed

Enhanced Development Workflow Documentation

• Added explicit forking instructions for contributors using different GitHub accounts with numbered steps and clear UI guidance
• Provided both HTTPS and SSH cloning options with placeholder examples (YOUR_USERNAME) to avoid confusion
• Enhanced branch creation guidance including naming conventions and best practices
• Improved fork syncing documentation with comprehensive command sequences and detailed explanations

New Quick Start Section

Added a streamlined "Quick Start: Contributing from Another GitHub Account" section that provides an overview of the entire process before diving into detailed instructions.

Authentication and Troubleshooting

• Added dedicated troubleshooting section covering common authentication issues (permission denied, SSH setup, personal access tokens)
• Included guidance for both authentication methods (HTTPS with tokens, SSH keys)
• Provided solutions for common sync issues (merge conflicts, outdated forks)

Documentation Integration

• Updated main README.md to prominently feature the enhanced workflow guide for contributors using different accounts
• Enhanced CONTRIBUTING.md with a dedicated section explaining the fork-first approach for external contributors
• Ensured consistency across all documentation files with proper cross-references

Why This Matters

Many potential contributors are unsure about the proper workflow when contributing from personal GitHub accounts to organization repositories. The previous documentation assumed familiarity with the fork-and-clone workflow, which created barriers for new contributors.

This enhancement makes the UI5 Web Components project more accessible to:

• First-time open source contributors
• Developers contributing from personal accounts
• Contributors who need authentication guidance
• Anyone looking for a complete, step-by-step workflow

Validation

The documentation has been comprehensively tested to ensure:

• All internal links and file references are valid
• The workflow covers the complete contribution cycle
• Instructions are clear and actionable
• Integration with existing UI5 Web Components conventions is maintained
• Node.js version requirements are consistent across all documentation

The enhanced documentation now provides a complete answer to "how to clone this repo and branch on another account" while maintaining professional standards and following established UI5 Web Components contribution patterns.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• download.cypress.io
• googlechromelabs.github.io
  • Triggering command: /usr/local/bin/node install.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}