Ability to load Markdown from a gist?

[pdehaan]

Similar to Lighthouse reporter. Not sure about something like an Express version of this which fetches a remote Gist by ID (https://octokit.github.io/rest.js/v17#gists-get).
Not sure if we want to get as silly as fetching for revisions or supporting multiple files per gist. I'd need to experiment with the API to see what it returns.

PROS: Cool AF.
CONS: API quota and live fetching/rendering would require D3 at runtime and GitHub API keys.