Consider / plan a conversion to Gatsby (with `spec-md` as a plugin?)

[abernix]

Follows-up on #6

Netlify and Gatsby is the predominant way we build sites at Apollo. While it has some shortcomings, our team is familiar with it and we should build on that (and have them fix the short-comings). That said, I find spec-md to be pretty great for what we're trying to represent here.

Strawdog/needs-full-plan: I think rather than generating the spec-md HTML via CLI, we could instead use its API's html method, perhaps coupled with a Gatsby source plugin like, but maybe not gatsby-source-plugin and a subsequent transformer.

[glasser]

Two bits of brainstorming about the structure of this repo:

• Given that there's styling for specs that live in this repo but affect rendering of the other repos (eg anatomy.css), it might be nice for the sake of deploy previews to just merge the repos into one and put join and core in subdirectories
• If we end up in a situation where we have a bunch of different versions of each spec to maintain, all of which may sometimes need to be updated in parallel for non-normative reasons (formatting/meta stuff, fixing typos, etc), and each of which are primarily just one file (plus a handful of images, examples, etc), it might be a lot more comfortable to have each version live in a subdirectory on main rather than on different branches, so that that kind of change can be handled in a single find-and-replace PR to all files in a tree rather than having to do a lot of merges across each versioned branch. (I think this is different from the "document a couple major versions of a library" case because we may end up with more versions to maintain of one page each, rather than a smaller number of major versions of a very large site.)