Implement a better pattern for how static markdown file content is getting imported & rendered

[jsoules]

The current pattern I've used for importing markdown files is fetch followed by a chain of async operations; this is used in the About section, as well as the Algorithms and Metrics descriptions.

The files probably still need to get loaded asynchronously (since while they live on the server, they are pulled dynamically so that we don't have to re-release in order to make edits to copy) but I think we have a better model for how to do this somewhere--just don't remember where it is.