Removed release packages from linux downloads page. Rationale: - They are only available for stable branch - They are only available for CentOS/RHEL - The repo they configure does not include those packages so they are impossible to update

<!--
  Copyright (C) Igor Sysoev
  Copyright (C) Nginx, Inc.
  -->

X:stylesheet {

X:param VERSION = "'development'";

X:output method="text";

X:template = "/versions" { !! "download[@tag=$VERSION][1]/item[1]/@ver"; };

}