feat: documentation

[grabbou]

Well, we should add documentation and guides to our website. Let's make this an umbrella and make sure we have enough documentation this year!

[dfosco]

Not worth creating a separate issue, but removing the $ from commands on the docs helps speed things up and makes beginners less likely to trip up: just copy the command and it'll work as is.

[grabbou]

Oh yeah, good suggestion. I don't know where I got this from. Feel free to send a PR! Also, I would be down to hear your thoughts on things that are missing in the docs, or confusing!