Request: Discourse footnote plugin

@techlore Please consider adding the official Discourse footnote plugin.

I believe it would be eminently useful on this forum due to the prevalence of asides and intertwined topics in security and privacy discussions. As an example, I wish I could have used true footnotes in this post: What do you think of the ubuntu rolling rhino remix? - #2 by wj25czxj47bu6q.