Move Deployment files (Step 5)

Moved 9 files to deployment/:

Production Setup (2):
- guides/deployment.md
- javascript/capistrano-deployment.md

Troubleshooting (4):
- troubleshooting/README.md (already in deployment/)
- javascript/troubleshooting-build-errors.md
- javascript/troubleshooting-when-using-shakapacker.md
- javascript/troubleshooting-when-using-webpacker.md

Maintenance (1):
- additional-details/updating-dependencies.md

Rails-Specific (3):
- rails/turbolinks.md
- rails/rails-engine-integration.md
- rails/convert-rails-5-api-only-app.md

All deployment, troubleshooting, and production-related docs now in one place.

Part of IA redesign Phase 2, Step 5.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: ihabadham