add reference to hubAdmin::create_config() in quickstart

[nickreich]

It would be good to point users to this tool to help with configuration
https://hubdocs.readthedocs.io/en/latest/quickstart-hub-admin/tasks-config.html

[micokoch]

I went through the functions in hubAdmin, and it wasn't clear to me how I would integrate this into the quickstart. Not much is explained in the package page, and when going through the function help page, create_config requires one to create a round first.

So, my questions are: where in the quickstart would I point users to these tools, and what should I point to?