Make contributing to the handbook easier

[sbalnojan]

Currently, to contribute to the handbook and preview my changes before committing them, I'll need to have a longer list of dependencies installed.

Ideally, I'd love to start contributing simply by running a ./go script which has most of the dependencies as well as the information inside https://handbook.meltano.com/meta already wrapped into it.

That could be accomplished e.g. by using docker compose or (my favourite choice) using batect a lightweight wrapper around docker+.