This commit removes the Non-Reserved CQL Keywords and Reserved CQL Keywords pages-keyword as that content is already covered on the Appendices page. Redirections are added to avoid 404s for the removed pages. In addition, the Appendices page title is extended with "Reserved CQL Keywords and Types" to help users understand what those appendices are about. Fixes https://github.com/scylladb/scylladb/issues/24319 Closes scylladb/scylladb#24320