Is your feature request related to a problem? Please describe.

Configuration options are not documented on the web site.

Describe the solution you'd like

I need to look at the code (i.e. the *Config classes) or at the Javadoc in order to determine the configuration options. I'd like to have it documented on the website and to be sure that the configuration options match whatever

Currently NodeConfig::listen_address field is non-optional, though it is set to 0.0.0.0 by the "generate-config" command. This special value means "listen to everybody" and can be replaced by None.

we need to have a tutorial to briefly introduce our system and help collaborators get started

Good refernece
https://github.com/ethereum/go-ethereum/wiki/Contract-Tutorial
https://github.com/EOSIO/eos/wiki/Tutorials
https://docs.python.org/3/tutorial/
https://reactjs.org/tutorial/tutorial.html

We will add the tutorial to our contributing guideline