compare-with-create-first-update

[lisa-parity]

Update local blockchain tutorial in the sandbox with changes from polkadot-developers/substrate-docs#607

[sacha-l]

LGTM 👍🏻

One thing: is there a reason to remove "bash" in the command snips? The reason I think we should keep them in is because it'll help when we integrate with web dev.

[lsgunnlsgunn]

Lol, I removed them because they weren't in your PR branch that I was comparing against.
They aretbeing handled quite right in the mkdocs formatting,. It I haven't had that problem before so I suspect the vanilla theme needs a highlight.js extension.