docs(Jenkins): [INFRA-1613] Deprecate Jenkins Classic & X tutorials

[tyndria]

What

Summary of changes

Jenkins demo uses old version of core-builder image. In order to get rid of the core-builder image's dependencies (and simplify maintenance of core-builder image), I propose to remove these demos + docs.

• Removed Jenkins X & Jenkins Classic tutorials from the docs
  • The "CI/CD MLOps at Scale" page is removed as well
• Removed Jenkins X & Jenkins Classic demos from the /examples folder

P.S. I haven't touched old docs.

Checklist

• Added/updated unit tests
• Added/updated documentation
• Checked for typos in variable names, comments, etc.
• Added licences for new files

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB