main: add move tool listing to --list-tools
main: add move tool listing to --list-tools

And make it the central place listing available tools (to minimize the
places to update when adding a new one). The description is edited to
point to this command instead of listing the tools itself.

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla