Split first steps

[deadghost]

The first steps document is a bit heavy and assumes a lot about what the user wants to do. Personally I skipped over it entirely. Instead, I started by running scripts locally, then on an existing server. I don't want to spin up a bunch of AWS nodes that I'd potentially need to pay for as Issue #51 points out.

I'd split first steps into: Getting Started Locally, Getting Started With An Existing Server, Getting Started In The Cloud. This covers a range of entry points for new users with potentially broad use cases.