Update calculating-che-resource-requirements.adoc

[ibuziuk]

What does this pull request change?

• Adds info about aditional memory and CPU will be added implicitly for the Visual Studio Code - Open Source ("Code - OSS")
• Remove Devfile registry due to deprecation and removal - Deprecate and archive che-devfile-registry che#22960
• Update DWO requests and limits based on the recent changes - Update memory limit to 5Gi devfile/devworkspace-operator#1346

What issues does this pull request fix or reference?

Specify the version of the product this pull request applies to

Pull Request checklist

The author and the reviewers validate the content of this pull request with the following checklist, in addition to the automated tests.

• Any procedure:
  • Successfully tested.
• Any page or link rename:
  • The page contains a redirection for the previous URL.
  • Propagate the URL change in:
    • Dashboard default branding data
• Builds on Eclipse Che hosted by Red Hat.
• the Validate language on files added or modified step reports no vale warnings.

[github-actions]

🎊 Navigate the preview: https://680b90fe0da36997e42891ff--eclipse-che-docs-pr.netlify.app 🎊

[github-actions]

Click here to review and test in web IDE:

[deerskindoll]

lgtm