Add docs site

[lkipke]

Change summary

This adds a docs folder to be powered by docsify and deployed via Github pages. I realize this is a ton of changes to review. Almost all of it was copied over from this README and the brs README.

For reviewing, I highly recommend you run this code locally (npx docsify serve ./docs) and view the site that way, it'll be much easier than going through the raw files in this PR 😅

There are a couple empty pages with TODOs in this PR -- they're placeholders for pages that I think we should write in the future at some point.

[alimnios72]

This looks awesome, just one comment below

[sjbarag]

I'm super excited about this! When we start making changes to this later, I imagine we'll need to gh pr checkout each PR to see what the rendered markdown looks like each time?

[sjbarag]

What's involved in updating the sandbox? I imagine we'll need to change that one day. Is it a codepen kind of thing where the URL includes a hash of the source, and if the sources change we just update the URL here?

[lkipke]

Hmmm not quite a hash, I don't think. The base link wouldn't change if the sandbox gets updated, but the url parameter with the file name might need to change if the file got removed. I only added that parameter because I thought it was a nicer entry point than the default package.json, but we can always change it 🤷‍♂️

[lkipke]

I'm super excited about this! When we start making changes to this later, I imagine we'll need to gh pr checkout each PR to see what the rendered markdown looks like each time?

Yeah, most likely. I mean, looking at the "raw" markdown is also reasonable enough if it's a small change -- docsify just takes markdown and styles it in a more attractive way.