Update Docker setup in readme about web HOT 2 OPEN

This is where my lack of Docker knowledge shows: it’s not a technology I use particularly beyond starting a container sometimes, and this was my first attempt to actually write a Dockerfile myself.

Either way, I spun up your latest changes and am getting 500 errors. Not sure if it’s a config problem at my end or not, will spend a little time debugging.

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OK. The sticking point in that PR was that the person wanted to add guards to start-server.sh to not initialize the container if it was already initialized; but in my thinking, there must be a place where we can put initialization code so that it initializes the container exactly once, so adding guards is not the right solution.

For example if we have a container with a database, when we create the image we want to pre-populate the database with data for initial configuration. There must be a way to do that exactly once - otherwise every time the container starts the database would get overwritten with pre-populated data!

I don't know where that place is, so we have to figure this out. Or maybe the person in the PR was also wrong?

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