Fix 404 link to SoapUI projects page

[yada]

Broken link (404)

• URL: https://www.soapui.org/soapui-projects/soapui-projects.html
• HTTP status: 404
• Found on: https://microcks.io/documentation/references/artifacts/

What to do

• Update the docs to point to SoapUI’s current equivalent page (their site structure likely changed).
• Verify the new link is stable and relevant to the section.

Help needed

If you’re unsure which SoapUI page to use as replacement, comment here and we’ll help validate.