fix URL for preview site in README [skip ci]

Author: mojavelinux

README.adoc

@@ -21,7 +21,8 @@ endif::[]
 :url-project: https://github.com/{project-repo-name}
 :url-site: https://docs.couchbase.com
 :url-repo: git@github.com:{project-repo-name}.git
-:url-preview: https://cb-docs-ui.netlify.com
+//:url-preview: https://cb-docs-ui.netlify.com
+:url-preview: https://cloud--brave-saha-095114.netlify.app
 // External URIs:
 :url-antora: https://antora.org
 :url-git: https://git-scm.com