Icons in front matter

[mattomis]

What is the requirement for using icons in front matter?
It seems like the requirement is having at least two files to create a partials template in /layouts/partials that defines what icons will be references in the front matter and for which keys. Those files are _ico.html and ico.html.
In my case I created a folder in my project called partials in layouts, and then created a file called ico.html but I have no idea what is supposed to go in that file or in _ico.html other than MAYBE exactly whatever is in those files in this github project. I mean I have found something here that says you need to have some text along the lines of:
{{ .Params.icon | markdownify }} but I have no idea how to use that information in creating the template(s).

If you want to have front matter like this:

---
title: "This is a title preceded by an icon in the sidebar"
icon: {{< ico inbox-full>}}
---

But I do not see how these things work together to produce the desired effect.

[RoneoOrg]

This is discussed on discourse.gohugo.io