feat: Add DevOps CI/CD presentation - Fixes #75

[Raj-glitch-max]

What this PR does

Adds a comprehensive CI/CD presentation for DevOps learners

##Changes

• Created presentations/devops-cicd.json with 25+slides
• Covers CI/CD fundamentals, tools, and best practices
• Updated presentations.js configuration

Closes #75

[github-actions]

Welcome, awesome contributor! ✨ Thank you for your first pull request to Bude Global. We appreciate your effort in making our collection even better. We'll be reviewing your changes soon.

[aravind-govindhasamy]

the presentation must be contains 50+ slides , thank you for your interest.

[aravind-govindhasamy]

Thanks for the contribution, @Raj-glitch-max 👏
The CI/CD presentation is well-structured and covers important DevOps fundamentals clearly.

To align with Bude Global Tech Presentations standards, we require presentations to include 50+ slides so they can serve as a complete, standalone learning resource for learners.

Suggested areas to expand:

CI vs CD (deeper comparison with real-world flow)

CI/CD pipeline architecture (step-by-step)

Popular tools comparison (GitHub Actions, GitLab CI, Jenkins, Azure DevOps)

YAML pipeline examples with explanations

Environment strategies (dev, staging, prod)

Secrets management

Rollback strategies

Monitoring & alerts post-deployment

Common CI/CD failures and how to debug them

DevOps best practices & anti-patterns

Beginner-friendly real-world CI/CD workflow example

You’re welcome to use AI tools like DeepSeek to help expand slide content and explanations—just ensure clarity, correctness, and simplicity for beginners.

Once the presentation is expanded to 50+ slides, we’ll be happy to review and proceed further.
Thanks again for your interest and effort 🚀