Add useful sample url arguments to config.md documentation

[ColmDC]

Is your feature request related to a problem? Please describe. Setting appropriate url arguments to configure a Mykomap is not obvious.

Describe the solution you'd like Update the documentation to provide real examples of how to use each argument type. https://github.com/DigitalCommons/mykomap/blob/master/CONFIG.md

Describe alternatives you've considered How could we make it obvious that an arguement was incorredctly set, and so ignored