advertise in the contrib

support xdg basedir Use XDG-compliant paths unless ~/.telescope already exists. Provide a script to migrate to XDG-style directory for users who wish to do so.

prettify the defaults settings Switch from the brutalist approach to a prettier ones. If someone likes the old brutalist theme, it's still available as contrib/brutalist.config: $ cp contrib/brutalist.config ~/.telescope/config or $ telescope -c contrib/brutalist

update the readme and add more stuff in contrib