remove outdated ci workshop references

[MikeMcC399]

• closes Outdated CI Workshop #5228

This PR removes the link to the outdated cypress-io/cypress-workshop-ci from

• Guides > Continuous Integration > Workshop

• Workshop > Cypress on CI

The materials used by the workflow are outdated and archived.

• See also cypress-workshop-ci-example outdated and archived cypress-workshop-ci#9.

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[cypress-app-bot]

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.

[MikeMcC399]

• There is an overlap between this PR and chore: remove cypress workshop and references as the repository is ar… #5291, however since the latter PR has been stalled for the last 3 months I wanted to at least simply clean up the obsolete CI workshop references.

[jaffrepaul]

Thanks Mike. We're putting some thought into how to replace this content with something relevant.

[MikeMcC399]

Thank you Paul @jaffrepaul !

Please also review the Justin James / Gleb Bahmutov video on Guides > Continuous Integration for its relevancy to current offerings - for instance there is no mention of GitHub Actions in the video.