Research the ability to add footnote capabilities so we can add footnotes to the guides-source

[mansona]

This issue is a placeholder for some research that is required to look into adding footnotes. This is not purely a technical issue, we need to investigate the effect on writing style if we were to add this functionality. We also need to be mindful of the portability of the Markdown if we're using a custom extension that isn't available in all flavours of markdown.

Useful links

Showdown extensions currently defined:

guidemaker-ember-template/app/templates/components/guides-article.hbs

Line 19 in 2032bad

{{markdown-to-html model.content extensions='showdown-section-groups'}}

potential footnote extension: https://github.com/Kriegslustig/showdown-footnotes

Architectural notes

It's probably not sensible that the showdown extensions are actually defined or used in any way from the template 🤔 it is probably worth investigating a way to make this a guidemaker concern before adding to the existing extensions. Some examples might be to have a custom component in guidemaker that deals with markdown rendering (and setups all the correct addons)