Scrollable one-page for /docs

[joenash]

General Summary

Render all of a given submodule as a scrollable one-page.

Motivation

An alternate mode of viewing the page that facilitates long reads and vigorous ctrl-f'ing.

[iamrecursion]

The one page should be on a per-repo basis, I think. I don't think we want to merge developer docs from different repos into a single page, do you?

[joenash]

Agreed, sorry that's what I was going for with of a given submodule

[joenash]

Thinking on implementation, we could either generate a one pager for each directory in route, or add a frontmatter field to a README which we look for to then create a one pager from all the files/directories below it