docs: Add comprehensive journey documentation for blog

- Complete timeline from private GitLab to MCP Registry
- All failures documented with solutions
- Security sanitization process detailed
- CI/CD migration steps explained
- PyPI packaging journey covered
- 10 key lessons learned for others

This documentation serves as a blog post resource for uk4.in
and social media (LinkedIn) to help other developers publish
their first MCP servers.

Author: Uttam Jaiswal