Integrating the Ignite Chain documentation for chain launch in network docs

[lumtis]

It's important to provide clear documentation of the Ignite Chain for the launch coordination part to support the network commands documentation under https://docs.ignite.com/network/introduction for advanced users to understand how the commands work

I propose to integrate the documentation we have in Whitepaper-1 file into a section Ignite Chain under https://docs.ignite.com/network

I would prefer not to break the https://docs.ignite.com/network/introduction link shared in many place, so what I'm thinking about is:

We keep the section named Network, this is the documentation for the ignite network commands.

The first subsection is Ignite Chain, this introduces the ignite network commands by presenting the Ignite Chain, the "backend" for the commands, then the second subsection introduces the actual commands.

In the future, when the whitepaper will start to look like an actual whitepaper for a chain, we can move the content for the chain into a dedicated page for it with the full whitepaper

@fadeev @aljo242 @ilgooz @scottcarterco