Editing of setup mainnet node guide

[alibabaedge]

In mainnet installation instructions not indicated, that we need to create directorys for cosovisor wit current version of binary ('cause the cosmovisor requires directory with genesis binary and the current, which is for example ~/.liked/cosmovisor/upgrades/v14 for now). Also would be great to add information about how to sync the chain with snapshot, 'cause it's more effectively. And, as the provided script (which is run with command "make -C deploy setup-node") is creating a service file for running a chain with cosmovisor, better to use the line "ExecStart" with the following: "ExecStart=$PATH_TO_cosmovisor run start --x-crisis-skip-assert-invariants ..."