docs: update docker page with updated flow

# fix up docker page
1. quick start - this should be the first step
1. persistent storage
1. Don't need init, remove this step
1. this guide should show you how to (a) make store location (b) then run with that store location
1. 3rd option, "use light node with rollup"
1. move the advice for ports to the bottom where you have a
1. Nice-to-have: use names to name the container to make it easier to interact with

cc @MSevey for vis and for anything I missed