Update install kite

Refers to 0.18.0. Changed it so that 0.18.0 is an example, rather than the only form of the command.
There's no need to mention this is a jar. The important thing is that this is executable with the right permissions (+x) so I'd change "JAR" to "executable" instead. You can also change "and prepare it for and install Kite" to "and set the file permissions". See below, but we can remove the instructions to replace the version number.