This commit removes the Open Source vs. Enterprise matrix from the Open Source documentation. In addition, a redirection is added to prevent 404 in the OSS docs, and to the removed page is replaced with a link to the same page in the Enterprise docs. This commit must be reverted enterprise.git, because we want to keep the Matrix in the Enterprise docs. Fixes https://github.com/scylladb/scylladb/issues/17289 Closes scylladb/scylladb#17295